... 2-picoline N-oxide to the acetate of 2-pyridine methanol, hydrolysis of the acetate to the alcohol, oxidation of the carbinol to the aldehyde, and then ...

... ACETATES, ALDEHYDES, BORON COMPOUNDS, FLUORIDES, SUBSTITUTES, ETHERS, PYRROLES, SPECTROSCOPY, PHENYL RADICALS. ...

Polymeric Schiff bases produced in quantitative yields by reaction of acetals of aryl aldehydes with

... Descriptors : *THERMOCHEMISTRY, HEAT OF FORMATION, ALCOHOLS, ALDEHYDES, CARBOXYLIC ACIDS, ESTERS, FORMIC ACID, ACETIC ...

The paper describes acetalization of aliphatic and aromatic aldehydes with methanol catalyzed by H-ZSM-5 at room temperature. The reactions are characterized by the following features: (1) The reaction rates are faster with aromatic aldehydes relative to the aliphatic aldehydes. (2) The reaction exhibits shape ...

The authors report that samarium(II) compounds promote aldol reactions of silyl ketene acetals with aldehydes. The stereochemistry of the process was investigated and routes to selected enantiomers were found. 4 tabs.

... unsaturated), alicyclic, and aromatic hydrocarbons, chlorinated hydrocarbons, Freons, alcohols, aldehydes, acids, ketones, acetates, ethers, and ...

... ACETIC ACID, ALDEHYDES, CHEMICAL REACTIONS, DETERMINATION, ETHYLENES, CARBINOLS, ORGANIC SOLVENTS, SALICYLIC ACIDS, ...

The in situ transformation of ?,?-unsaturated aldehydes into ?-chloroallylic acetates and subsequent copper-catalyzed regio- and enantioselective (up to 94% ee) allylic alkylation with Grignard reagents provides chiral enol acetates and chiral ?-substituted aldehydes in a one-pot protocol. PMID:20822134

A means is proposed for separating propylene glycol and other compounds bearing multiple hydroxyl groups by reversible chemical reaction. Glycols react with aldehydes in cyclic acetalization reactions to form substituted dioxolanes. Propylene glycol react...

Organic chemistry exam/quiz questions. Keywords: Synthesis, Acetals, Imines, Enamines, Wittig Reaction, Oxidation-Reduction, Aldol Reactions, Alkylation, a,b-Unsaturated Aldehydes and Ketones, b-Dicarbonyl Compounds, Mechanisms of Reactions.

[reaction: see text] Iron(III) chloride-catalyzed effective allylation reactions of acetals with allyltrimethylsilane proceeded smoothly in high to excellent yields. In addition, this method could be applied to the one-pot synthesis of homoallyl benzyl ethers by a combination of dibenzyl acetalization of aldehydes and consecutive ...

Copper-catalyzed coupling of oxime acetates with aldehydes offers a new strategy for the synthesis of highly substituted pyridines. This novel method tolerates a wide range of functionality and allows for rapid elaboration of the oxime acetates into a variety of substituted pyridines. PMID:21913647

trans-(2-Methoxycyclopropyl)carbinols were obtained in the form of equimolar mixtures of diastereomers by the reaction of the respective alkyl trans-2-methoxy-cyclopropyl ketones with lithium aluminum hydride or organometallic compounds. Methanolysis of the products in an acidic medium leads to high yields of the dimethyl acetals of trans- and ...

Polyvinyl alcohol films have been made water insoluble by acetalization with aldehydes, such as formaldehyde (Ref. [). This is usually accomplished ...

... parts by weight of a filler selected from the group consisting of Group I and II metal phosphates, carbonates, acetates, oxalates and sulfites; and (c ...

... in acetic acid-sodium acetate at 606o ... Wieland-Gumlich Aldehyde) kV), Eperimenta to change Nb - Dimthylcaracurin-V (XV) in a water slightly acidic ...

ABSTRACT : Acetaldehyde is an important intermediate in chemical synthesis and a byproduct of normal oxidative metabolism of several industrially important compounds including ethanol, ethyl acetate and vinyl acetate. Chronic inhalation of acetaldehyde leads to degeneratio...

This battery contains an alkaline electrolyte; it has, within a container, the electrolyte and two electrodes separated by a separator. The separator is made of a partially reticulated polyvinyl acetal produced by the action of at least one aldehyde on polyvinyl alcohol; an aromatic aldehyde is preferred. The ...

The chromic acid oxidation of benzaldehyde in 96% acetic acid had been found to produce chromium(V) as an intermediate. The rate constants for the chromium(VI) and chromium(V) oxidations were obtained for benzaidehyde as well as for substituted benzaldehydes, benzaldehyde-d, and a group of aliphatic aldehydes. The data are compared with the ...

(E)-N-trimethylsilyloxyenamines, easily accessible from aldonitrones, proved to be excellent nucleophiles in TMSOTf-induced diastereoselective aldol reaction, both with ketals and acetals, proceeding via an extended transition state and leading to a new aldol C-C-bond in the aldonitrone products, that can be readily hydrolysed to the corresponding ...

A mild and metal-free access to 1,2,4-tri or 1,2,4,5-tetrasubstituted pyrroles has been developed by the reaction of Morita-Baylis-Hillman acetates of acetylenic aldehydes with amines and sulfonamides. This new protocol is based on K(2)CO(3)-promoted tandem allylic substitution/cycloisomerization reactions. PMID:21748180

Gold-catalyzed reactions of 2-(ynol)aryl aldehydes were investigated. Benzochromanes were obtained from the reaction when AuCl(3) was employed as the catalyst, whereas benzobicyclo[n.3.1]acetals were produced when triazole-gold was employed as the catalyst. Plausible mechanisms are discussed. PMID:20843094

The occurrence of reactions related to losses of the target products, aldehydes and alcohols, was established in continuous rectification of the products of hydroformylation of propylene. The sections of the zone of primary occurrence of the reactions of aldol condensation, formation of acetals, and esterification of butyl alcohols with butyric acids were ...

A simple and efficient method to convert aldehydes into alpha,beta-unsaturated aldehydes with a two-carbon homologation is presented. Hydroboration of ethoxy acetylene with BH(3).SMe(2) generates tris(ethoxyvinyl) borane. Transmetalation with diethylzinc, addition to aldehydes or ketones, and acidic workup affords enals. When the ...

Glycerol acetals from butanal, pentanal, hexanal, octanal and decanal were prepared with the use of Amberlyst-15 acid resin as catalyst. The glycerol conversion decreases with the size of the hydrocarbon chain. This fact has been associated with formation of micelles and aggregates of the aldehyde to minimize the interaction between the polar glycerol ...

Particle growth by the heterogeneous reaction of aldehydes was observed in 0.5 m3 indoor Teflon bags in the presence of background seed aerosols. The aldehydes used were: glyoxal, butanal, hexanal, octanal, and decanal. To study acid catalyst effects on aldehyde heterogeneous reactions, one of the Teflon bags was initially filled with ...

material was extracted with ethyl acetate and washed with brine and water. The combined organic phases were temperature for 3 h. The reaction mixture was diluted with water and extracted with ethyl acetate (3 x 5 m with 80% ee (Scheme 3). Upon recrystallization from ethyl acetate/hexane (3:7), the amino- aldehyde

The authors have investigated the possible conversion of formaldehyde to formate and of acetaldehyde and peroxyacetyl nitrate (PAN) to acetate when sampling organic acids in urban air using alkaline traps. Tests were carried out with cartridges (C{sub 18} and alumina) and with filters (25 and 47 mm, glass or paper) coated with KOH and carbonate, aldehydes ...

A highly versatile and efficient hydrosilylation method by palladium nanoparticle catalysis allows the direct and chemoselective synthesis of 1)?enolsilanes of high isomeric purity, 2)?saturated aldehydes or ketones, or 3)?the corresponding saturated acetals from ?,?-unsaturated aldehydes or ketones. The choice of the product is ...

A highly efficient copper-catalyzed ?-amination of aliphatic aldehydes for the synthesis of ?-amino acetals using secondary amines with readily removable protecting groups as a nitrogen source was developed. This reaction can be operated under very mild conditions, affording the desired products in moderate to good yields. PMID:21475752

causes cross-linking via acetalation of the 1, 3 diol units. .... Aldehydes in acid media undergo acetalization with 1,3 diols as exemplified in ...

The first example of an aldol condensation involving an enamine and an aromatic aldehyde in the presence of u.v. light, equimolar amount of acetic acid and catalytic amount of hydroquinone is described. This new procedure gives significantly high yields o...

A method of making a phosphono-substituted dipyrromethane comprises reacting an aldehyde or acetal having at least one phosphono group substituted thereon with pyrrol to produce a phosphono-substituted dipyrromethane; and wherein the phosphono is selected...

Ground-state C3 reacts with alcohols by addition reactions, producing propargyl aldehyde acetals, (RO)2CHCCH. Excited-state C3 reacts with alcohols and other hydrogen-containing substrates to form C3 hydrocarbons. (Author)

. (d) Paterson, I.; Cowden, C. J.; Wallace, D. J. In Modern Carbonyl Chemistry; Otera, J., Ed.; Wiley

FeCl(3)6 H(2)O- and FeBr(3)-catalyzed Prins cyclization/halogenation of alkynyl aldehyde acetals has been realized with acetyl chloride or bromide as halogen source in dichloromethane to afford 2-(1-halobenzylidene or alkylidene)-substituted five-membered carbo- and heterocycles, and thus provides an alternative route for vinylic C-Cl and C-Br bond ...

The first part of our study of the enthalpy of reduction of carbonyl compounds has been completed and includes four aldehydes, acetone, a series of cyclic ketones and ethyl acetate. Results suggest that some of the literature data for these compounds are ...

The first part of our study of the enthalpy of reduction of carbonyl compounds has been completed and includes four aldehydes, acetone, a series of cyclic ketones and ethyl acetate. The results suggest that some of the literature data for these compounds ...

In the Dieckmann-Shapiro condensation of phthalides with p-dimethylaminobenzaldehyde the reaction rate decreases with an increase in the electron-donor effect of the substituent in the phthalide and becomes comparable to the rate of a competing reaction - Claisen condensation of ethyl acetate with the aldehyde.

A method of making a bacteriochlorin is carried out by condensing a pair of compounds of Formula II to produce the bacteriochlorin, wherein R is an acetal or aldehyde group. The condensing may be carried out in an organic solvent, preferably in the presen...

...ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES...by saponification of vitamin A acetate. The resulting...A Wittig reagent and vitamin A aldehyde are reacted...formula as a source of vitamin A in accordance with...g) of the act. (d) Prior sanctions...

The condensation of C,O,O-tris(trimethylsilyl)ketene acetal 1 with aldehydes 2 in the presence of catalytic amounts of mercuric iodide at room temperature affords syn and anti beta-trimethylsiloxy alpha-trimethylsilyl alkanoic acid silyl esters 3 in good yields. These new compounds gave, under acidic or basic conditions, E and (or) Z enoic acids 4. The ...

Vinyl acetate is subject to microbial degradation in the environment and by pure cultures. It was hydrolyzed by samples of soil, sludge, and sewage at rates of up to 6.38 and 1 mmol/h per g (dry weight) under aerobic and anaerobic conditions, respectively. Four yeasts and thirteen bacteria that feed aerobically on vinyl acetate were isolated. The pathway ...

Five methylation procedures, including base- and acid-catalyzed methods, were tested in thermoxidized methyl linoleate and trilinolein, in order to quantitate major oxidation short-chain glycerol-bound compounds by gas chromatography. Results indicated that transmethylations using KOH in methanol or CH3ONa-CH3OH in tert.-butylmethyl ether were the most appropriate methods, given the excellent ...

Potential new lubricants and fuel lubricity enhancers have been prepared from methyl 9,10-dihydroxystearate and long chain aldehydes to form the corresponding cyclic acetals. These materials are oils down to low temperatures, as compared to symmetric ketals derived from the same diol, which are waxes at room temperature. The acetals ...

The use of manganese as a mediator for allylations and pinacol couplings in aqueous media was investigated. The combination of manganese and copper is found to be a highly effective mediator for the allylation of aryl aldehydes in water. Such a combination is found to be more reactive than other previously reported metals in aqueous media. No reaction was observed with either ...

An aldehyde dehydrogenase (ALDH) involved in alkane degradation in crude oil-degrading Geobacillus thermodenitrificans NG80-2 was characterized in vitro. The ALDH was expressed heterologously in Escherichia coli and purified as a His-tagged homotetrameric protein with a subunit of 57 kDa based on SDS-PAGE and Native-PAGE analysis. The purified ALDH-oxidized alkyl ...

Three methods of in situ cross-linking polyvinyl alcohol films are presented. They are: (1) acetalization with a dialdehyde such as glutaraldehyde, (2) acetalization with aldehyde groups formed by selective oxidative cleaving of the few percent of 1,2 dio...

[Structure: see text] Reaction of 4-hydroxyisophthalaldehyde with excess phenyl magnesium bromide gave a dicarbinol and this condensed with pyrrole and aromatic aldehydes in the presence of BF3.Et2O to afford, following oxidation with DDQ, novel tetraarylcarbaporphyrinoids in 10-24% yield. Further reaction with silver(I) acetate or gold(III) ...

1-Butyl-3-methylimidazolium tetrachlorogallate, [bmim][GaCl4], prepared via microwave-assisted protocol, is found to be an active catalyst for the efficient acetalization of aldehydes under mild conditions....

The enantioselective total synthesis of pironetin has been achieved in 11 steps from known aldehyde 2. The synthesis relies on the formation of 5 out of 6 stereocenters through titanium mediated iterative aldol reactions. Key steps in this synthesis include an acetal aldol reaction to establish the stereochemistry at C8 and C9, an ...

A battery containing an alkaline electrolyte is described. It has within a container the electrolyte and two electrodes, separated by a separator. The separator is made of a partially reticulated polyvinyl acetal produced by acetalization on polyvinyl alcohol, preferably an aromatic aldehyde, which may also have at least one hydroxyl ...

This patent describes a subterranean formation having channels which have a high permeability to the flow of fluids. A process for retarding fluid flow in the channels comprises: providing a gel-forming composition which when substantially completely gelled in the high permeability channels is operable for retarding fluid flow therein. The gel-forming composition comprises: an aqueous solution ...

A composition and method for acid treating a subterranean formation are described. It has been discovered that the addition of various chemical additives such as formic acid, or acetic acid or the alkali metal or ammonium salt of formic acid or acetic acid, or hexamethylenetetramine (HMTA) will slow the rate of formation of a free acid when an ...

1. Oxidation of vitamin A acetate with monoperphthalic acid gave 5,6-monoepoxyvitamin A acetate, C₂₂H₃₂O₃, obtained as pale-yellow crystals, m.p. 65�66�. 2. Saponification of 5,6-monoepoxyvitamin A acetate yielded 5,6-monoepoxyvitamin A alcohol, which was readily ...

The first representatives of acetal and phosphocyclic lipids based on methriol (2-hydroxymethyl-2-methyl-1,3-propanediol) were synthesized. The interaction of the starting triol with higher aldehydes gave the corresponding alkylidene compounds, which were subsequently phosphorylated by derivatives of phosphorous acid. The intermediate amidophosphites were ...

Neighboring group participation has been demonstrated to be an effective process for 1,4-relative asymmetric induction for the addition of nucleophiles to chiral acetals and aldehydes. Moreover, this method has been extended to 1,2- and 1,3-relative asymmetric induction. The nature of the acetal and participating group was revealed ...

Treatment of acrolein diethyl acetal sulfide 8 with methanesulfenyl bromide at low temperature results in an efficient thiirane ring opening to a halo disulfide 9. The bromine in this halo disulfide is easily substituted by silver acetate, sodium azide, sodium iodide, and silver nitrate. Treatment of 9 with tetrabutylammonium acetate ...

A scalable, highly regioselective chromium-catalyzed homoaldol equivalent reaction employing 3-bromopropenyl acetate as a masked homoenolate nucleophile in additions to aromatic, aliphatic, and alpha,beta-unsaturated aldehydes under mild Cr/Mn redox conditions in good to excellent yields is reported. The resulting vinyl ...

The solution-phase synthesis of amido-, urea-, and aminofuranoses was achieved. Alkylated furanose aldehydes were treated with primary amines in the presence of sodium triacetoxyborohydride to give secondary amines. Subsequent acylation with acid chlorides and isocyanates afforded amidofuranoses and ureafuranoses, respectively. Second, reductive amination of furanose ...

Ascorbic acid has been shown to stimulate collagen synthesis through the induction of lipid peroxidation which leads to increased transcription of the collagen genes. To test the ability of aldehyde products of lipid peroxidation to mediate this effect, the authors treated cultured fibroblasts with 1-200{mu}M of malondialdehyde, acetaldehyde, glyoxal or hexenal in the presence ...

Female moths produce blends of odorant chemicals, called pheromones. These precise chemical mixtures both attract males and elicit appropriate mating behaviors. To locate females, male moths must rapidly detect changes in environmental pheromone concentration. Therefore, the regulation of pheromone concentration within antennae, their chief organ of smell, is important. We describe ...

Both aldehyde dehydrogenase (ALDH, EC 1.2.1.3) and the aldehyde dehydrogenase activity of alcohol dehydrogenase (ADH, EC 1.1.1.1) were found to coexist in Drosophila melanogaster larvae. The enzymes, however, showed different inhibition patterns with respect to pyrazole, cyanamide and disulphiram. ALDH-1 and ALDH-2 isoenzymes were detected in larvae by ...

Exposure of alcohols 1a-1i to butadiene in the presence of a cyclometallated iridium catalyzed derived from allyl acetate, 4-methoxy-3-nitrobenzoic acid and BIPHEP (2,2?-bis(diphenylphosphino)biphenyl) results in hydrogen transfer to generate aldehyde-allyliridium pairs, which engage in C-C coupling to form products of carbonyl crotylation. Under related ...

The volatile composition of four southern highbush blueberry cultivars ('Primadonna', 'Jewel', 'Snowchaser', and 'FL02-40') grown in two locations (Gainesville and Haines City, FL) and harvested multiple times was investigated. A total of 42 volatiles were identified, including 8 esters, 12 terpenoids, 11 aldehydes, 7 alcohols, and 4 ketones. Twelve of these volatiles are ...

The formation of acetates by the dissociation of acetic acid on the clean Rh(111) surface and by reactions of acetic acid, acetaldehyde, and ethanol with preadsorbed oxygen atoms was examined using HREELS and TPD. Acetate intermediates were identified by the characteristic vibrations of the O-C-O moiety ...

The addition of the acetals of saturated aldehydes (formaldehyde, acetaldehyde, propionaldehyde, butyraldehyde, and isobutyraldehyde) to 2-trimethylsilyloxy-4-methyl-1,3-pentadiene in the presence of aprotic acids (ZnCl/sub 2/, ZnBr/sub 2/, FeCl/sub 3/, SnCl/sub 4/, BF/sub 3/ /times/ OEt/sub 2/) takes place at positions 1, 2 of the diene system with the ...

Rubrivivax benzoatilyticus JA2 produces indoles with simultaneous utilization of L-tryptophan. Fifteen chromatographically distinct indole derivatives were detected from the L-tryptophan-supplemented cultures of R. benzoatilyticus JA2. Nine of these were identified as, indole 3-acetamide, Methoxyindole-3-aldehyde, indole 3-aldehyde, ...

A method for carbonyl allylation and crotylation from the alcohol oxidation state via allyl acetate-alcohol transfer hydrogenative C-C coupling is described. Exposure of allyl acetate to benzylic and allylic alcohols 1a-9a in the presence of an iridium catalyst derived from [IrCl(cod)]₂ and BIPHEP delivers products of C-allylation ...

A combined Lewis acid catalyst of InCl(3) and Me(3)SiBr promoted the direct use of enol acetates in the coupling with low-reactive silyl ethers, in which functional groups including ketones and aldehydes survived. Sterically hindered silyl ethers such as ROSiEt(3), ROSiPh(3), ROSit-BuMe(2), and ROSii-Pr(3) were also applicable. PMID:21526792

Trimethylsilyl halide activation of Fmoc-protected N,O-acetals yields reactive intermediates capable of efficiently adding to a variety of enamines. NMR studies have provided evidence that a stable halomethyl carbamate intermediate forms in solution. Good yields are obtained over a broad range of enamine nucleophiles encompassing both cyclic and acyclic ketone-derived and ...

(9, 10-/sup 3/H/sub 2/)Z9-14:Ac was synthesized at high specific activity (/sup 3/H, 58 Ci/mmole) by partial tritiation of the corresponding alkyne and was converted to the labeled Z9-14:OH and Z9-14:Al to study tissue specificity of acetate esterase (E), alcohol oxidase (OX), and aldehyde dehydrogenase (ALDH) in male and female Heliothis virescens. ...

Reaction of N-Boc-N-tert-butylthiomethyl-protected alpha-aminoorganostannanes with n-BuLi generates the corresponding alpha-aminoorganolithiums. Reactions of these organolithiums with aromatic aldehydes provides N-protected beta-amino alcohols with diastereoselectivities up to >99:1 anti/syn; with aliphatic aldehydes, diastereoselectivities were ...

Under the conditions of transfer hydrogenation employing an ortho-cyclometallated iridium catalyst generated in situ from [Ir(cod)Cl]₂, 4-cyano-3-nitrobenzoic acid and the chiral phosphine ligand (S)-SEGPHOS, ?-methyl allyl acetate couples to alcohols 1a�1j with complete levels of branched regioselectivity to furnish products of carbonyl crotylation ...

A tandem dimerization/macrocyclization reaction utilizing the Prins cyclization has been developed. This reaction develops molecular complexity through the formation of highly substituted dimeric tetrahydropyran macrocycles. Mild conditions utilizing rhenium(VII) catalysts were explored for aromatic substrates, while harsher Lewis acidic conditions were used for aliphatic substrates. Both ...

A tandem dimerization/macrocyclization reaction utilizing the Prins cyclization has been developed. This reaction develops molecular complexity through the formation of highly substituted dimeric tetrahydropyran macrocycles. Mild conditions utilizing rhenium(VII) catalysts were explored for aromatic substrates while harsher Lewis acidic conditions were used for aliphatic substrates. Both ...

Titanium chelate addition of aryl nucleophiles to cyclopropyl aldehyde 6 followed by a tin-catalyzed one-pot retro-aldol, acetalisation and lactonisation sequence afforded cis and trans ?-aryllactone acetals. A ?-furyllactone derived by this approach was further transformed in two steps to model compounds for the oxidised northeastern sectors of selected ...

Porous polymer packings have been used successfully in many applications of direct aqueous injection gas chromatography. The authors have expanded the use of aqueous injection to the quantitative analysis of 68 alcohols, acetates, ketones, ethers, sulfides, aldehydes, diols, dion...

Principal component analysis of UV-VIS-NIR transmission spectra of matured wine distillates (1-40 years aged) produced by three Moldavian manufacturers allows to characterize with sufficient certainty the eleven chemical parameters of considered alcoholic beverages: contents of acetaldehyde, ethyl acetate, furfural, vanillin, syringic aldehyde and acid, ...

Polysubstituted piperidines and tetrahydropyrans are synthesized from aldehydes and two classes of trisubstituted nitroolefins via an O-TMS protected diphenylprolinol catalyzed domino Michael addition/aminalization (or acetalization) process. This approach allows formation of four contiguous stereocenters in the piperidine or tetrahydropyran ring in one ...

D hydrolyseert vervolgens het gevormde 4-hydroxyfenyl acetaat tot hydroquinon en acetaat. Het hydroquinon wordt door een hydroquinon dioxygenase (HapC) geoxideerd naar hydroxymuconic semialdehyde. Dit aldehyde wordt NADPH O2 H2O O2 NAD+ H2O NAD( P) H 4-hydroxyacetophenone 4-hydroxyphenyl acetate hydroquinone 3

on selectivity became apparent when comparing cinnamaldehyde (5g) and R-methylcinnamaldehyde (5h) (entries 7 to that of either benzaldehyde or cinnamaldehyde. ReactIR moni- toring of the reaction with benzaldehyde revealed in the addition of 4a to cinnamaldehyde as well as the aliphatic aldehyde, hydrocinnamaldehyde (5k) (entries 2

to reduce aldehydes and ketones and semicarbazide to convert them to semicarbazones; acetic anhydride'-ethylphenoxy)-3-methyl-trans-2-hexenal(the ethylaldehyde) which in turn forms a semicarbazone or is oxidized: the acetoepoxide forms the acetodiol with aqueous acid, the a-hydroxyethyl epoxide with NaBH4, and a semicarbazone

Herein we report the conversion of aldehyde-containing potassium and tetrabutylammonium organotrifluoroborates to the corresponding amines through reductive amination protocols. Potassium formate facilitated by catalytic palladium acetate, sodium triacetoxyborohydride, and pyridine borane have all served as effective hydride donors, reducing the initially ...

Herein we report the conversion of aldehyde-containing potassium and tetrabutylammonium organotrifluoroborates to the corresponding amines through reductive amination protocols. Potassium formate facilitated by catalytic palladium acetate, sodium triacetoxyborohydride, and pyridine borane have all served as effective hydride donors, reducing the initially ...

It was shown that aldol condensation and formation of acetals occur during isolation of butyraldehydes by continuous fractionation of the products of oxo synthesis. Aldehyde losses due to chemical conversions decrease with increase of temperature in the reboiler, and may be virtually eliminated, while the selectivity of formation of the products of aldol ...

Methallyl chloride serves as an efficient allyl donor in highly enantioselective Grignard Nozaki-Hiyama methallylations from the alcohol or aldehyde oxidation level via iridium catalyzed transfer hydrogenation. Under identical conditions, methallyl acetate does not react efficiently. Double methallylation of 1,3-propanediol provides the C(2)-symmetric ...

o-Benzenedisulfonimide, a new strong bench-stable Br�nsted acid, has been shown to efficiently catalyze the Mukaiyama aldol reaction of aldehydes or dimethyl acetals with silyl enol ethers under mild solvent-free reaction conditions. PMID:21298181

An alkaline unwinding assay was used to quantitate DNA strand breaks (DNA SB) in the livers of rats and mice, in rodent hepatocytes, and in CCRF-CEM cells following treatment with tri- (TCA), di- (DCA) and mono-(MCA) chloroacetic acid and tri-(CH), di)(DCAA) and mono- (CAA) chlor...

An efficient and highly diastereoselective method for the construction of the hydroxylated tropane skeleton is described. The method features a new intramolecular reductive coupling reaction of N-acyl N,O-acetal with aldehyde, cooperatively mediated by BF(3)�OEt(2) and SmI(2). On the basis of this method, a new enantioselective total synthesis of (-)-Bao ...

...product/Subcategory Organic HAP/chemical name(CAS No.) Acet-aldehyde...process � � � ABS using a batch suspension process � � � ABS using a continuous...continuous process � � CAS No. = Chemical Abstract Service Number....

In the title compound, C₁₁H₁₂O₆, the aldehyde group is disordered over two sites in a 0.79:0.21 ratio. The carb�oxy�lic acid chain is found in the [ap,ap] conformation due to two intramolecular O�H?O hydrogen bonds.

The partial oxidation of 4-tert-butyltoluene to 4-tert-butylbenzaldehyde by hydrogen peroxide in glacial acetic acid, catalyzed by bromide ions in combination with cobalt(II) acetate or cerium(III) acetate, has been studied in detail. Based on the observed differences in reaction rates and product distributions for the different ...