Stuttgart � New York Abstract: Unnatural paramagnetic a-amino acids with 2,2,5,5-tet- ramethyl-2,5-dihydro-1-chains, including a lysine mimic azido precursor and their derivatives, are described. The new set of paramagnetic,2 One main group of unnatural amino acids have fluorophores or paramagnetic labels in the ...

... The early work of Kroll, Bender, and Westheimer on metal ion-promoted hydrolyses of/'a-amino acid esters and amides has provided the impetus ...

nonenzymatic synthesis of optically active amino acids from. 3 ,6 ,is , 17 , la/ their corresponding a-keto acids. During the course of the study of ...