... Accession Number : AD0710833. Title : REACTIONS OF ACETYL AND METHYL RADICALS WITH NITRIC OXIDE,. Corporate ...

... Hydrogen iodide acted as an excellent radical "trap" for these radicals. No spontaneous decomposition of acetyl radicals was observed. Relative ...

... RARE EARTH COMPOUNDS, *RARE EARTH ELEMENTS, ABSORPTION, ACETAES, ACETYL RADICALS, ACTINIUM COMPOUNDS, DIOXIDES ...

... in liquid and plastic hosts. ... COMPOUNDS), (*LASERS), ACETYL RADICALS, ACETONES ... COMPOUNDS, EPOXY RESINS, PLASTICS, GLASS ...

... Abstract : Carbohydrate derivatives of established radioprotective ... ACETYL RADICALS, AMIDES, CARBOHYDRATES, GUANIDINES, SULFUR ...

... the production of oxygen free radicals exceeds normal ... The pineal hormone, melatonin (N-acetyl-5-methoxy ... to be a potent free radical scavenger (4 ...

The $sup 33$S hyperfine structure has been observed in the electron spin resonance of irradiated crystals of cysteine.HCl.H$sub 2$O and of N-acetyl DL- methionine. An analysis of the results shows that in both substances the free radicals that are stable at room temperature are disulfide radicals, RCH$sub 2$SS. A possible ...

[Structure: see text] Peroxyl radicals formed from the addition of oxygen to carbon radicals of N-acetyl glycine, serine, and diglycine are directly observed at room temperature via time-resolved EPR spectroscopy. Isotopic labeling confirms the identity of the N-acetyl glycine and diglycine peroxyl analogues. The ...

Hyperfine structure due to 33S in its natural abundance of 0.76% has been measured in the electron spin resonance of free radicals produced by x-irradiation of single crystals of N-acetyl-L-cysteine at 77 K. These measurements proved that the radicals pro...

... Patents, *Antimicrobial agents, *Antimalarials, *Synthesis(Chemistry), Chemotherapy, Bacterial diseases, Malaria, Gonorrhea, Alkyl radicals ...

Alcohol drinking is known to lead to deleterious effects on prostate epithelial cells from humans and experimental animals. The understanding of the mechanisms underlying these effects is relevant to intraprostatic ethanol treatment of benign prostatic hyperplasia and to shed some light into the conflictive results linking alcohol consumption to prostate cancer. In previous studies, we provided ...

A pulsed CO sub 2 -TEA laser is used to dissociate free-radical precursors, and a photoionization mass spectrometer is used to monitor the reactions of the radicals. Experiments are in progress to find precursors which can yield alkyl, alkoxy, acetyl, and...

BS>Two methylation reactions of propionamide by the C/sup 14/-hot atom, and of methyl radical from Co/sup 60/ gamma -ray irradiation and methylation reaction of propionic acid by methyl radical from thermal decomposition of acetyl peroxide were carried out, and the reactivities of these species were studied. The methyl ...

The reaction between quinoxaline and benzopyridine in acetic anhydride in the presence of zinc dust gives a quinoxaline anion and a benzopyridine N-acetyl radical, which recombine to give the previously unknown N-acetyl dihydrobenzopyridine derivative of 1,2-dihydroquinoxaline. Under these conditions, quinoxaline alone gives ...

The electron spin resonance spectra of gamma-irradiated single crystals of acetyl-L-glutamic acid were measured at 9 and 23.4 kMc/sec for various orientations of the crystal in the external magnetic field. The structure of the free radical produced immediately after the irradiation of acetyl-L-glutamic acid was derived from ...

Double quantum transitions were observed at high rf fields in hyperfine spectra of electron spin resonance of the free radical produced by the gamma irradiation of acetyl-d,l-alanine. The presence of interaction between the free radicals give rise to the double quantum transitions. A theoretical explanation is given. (auth)

This work uses the photodissociation of acetyl chloride to assess the utility of a recently proposed impulsive model when the dissociation occurs on an excited electronic state that is not repulsive in the Franck-Condon region. The impulsive model explicitly includes an average over the vibrational quantum states of acetyl chloride when it calculates an ...

In aqueous solution acetaldehyde and its hydrate are in a 0.8:1 equilibrium. Hydroxyl radicals generated by the pulse radiolysis of N/sub 2/O-saturated water react with this mixture with an overall rate constant of k = 2.4 x 10/sup 9/ dm/sup 3/ mol/sup -1/ s/sup -1/, the rate of reaction with acetaldehyde being about 3 times faster than with the hydrate. The predominant ...

The structure and reactivity of the N-acetyl-cysteine radical cation and anion were studied using ion-molecule reactions, infrared multi-photon dissociation (IRMPD) spectroscopy, and density functional theory (DFT) calculations. The radical cation was generated by first nitrosylating the thiol of N-acetyl-cysteine ...

The structure and reactivity of the N-acetyl-cysteine radical cation and anion were studied using ion-molecule reactions, infrared multi-photon dissociation (IRMPD) spectroscopy, and density functional theory (DFT) calculations. The radical cation was generated by first nitrosylating the thiol of N-acetyl-cysteine ...

To ascertain the effects of the steric and electronic properties of various substituent groups in determining the total molecular and electronic structure of iminamino radicals, R2R3C=N-N-R1, ESR spectra of several radicals containing a variety of substituents(alkyl, acetyl, phenyl, 2,4-dinitrophenylphenyl, and silyl) were observed. ...

It was found that 2-pentanone and other higher ketones are synthetized in relatively high concentrations by gamma --ray irradiation of mixtures of acetadehyde and propylene at room temperature and that the reaction proceeds by a chain mechanism, with the acetyl radical as the initiator. (auth)

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ESR and ENDOR techniques were used to study the crystals of N-acetyl-D, L-alanine which were irradiated by X rays at room temperature. One of the unstable radicals was found to be CH/sub 3/CHCOOH.

The reaction of acetaldehyde and acetyl radical with atomic hydrogen was studied with a discharge flow tube equipped with an electron-impact mass spectrometer. Experiments were performed under the condition of excess atomic hydrogen at 299 {plus minus} 5 K. A rate constant for the reaction CH{sub 3}CHO + H {yields} CH{sub 3}CO + H{sub 2} (1) of (11 {plus ...

Free radicals produced by ..gamma.. irradiation at 77K in a single crystal of N-acetyl-DL-valine (CH/sub 3/)/sub 2/CHCH(NHCOCH/sub 3/)COOH were investigated by ESR spectroscopy. The aim of the experiments was to determine whether the paramagnetic centers observed at room temperature (i.e., (CH/sub 3/)/sub 2/CCH(NHCOCH/sub 3/)COOH and (CH/sub 3/)/sub ...

The reaction mechanisms of the photo-Fries rearrangement of 1-naphthyl acetate has been studied by means of steady-state photolysis and laser flash photolysis. A radical pair consisting of the 1-naphthoxyl and acetyl radicals is concluded to be a reaction intermediate. The yield of an in-cage product ...