By J. H. Jones
Professional Periodical experiences supply systematic and particular overview insurance of development within the significant components of chemical study. Written by means of specialists of their expert fields the sequence creates a different carrier for the lively study chemist, offering normal serious in-depth bills of development specifically components of chemistry.
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Additional info for Amino Acids and Peptides (SPR Amino Acids, Peptides (RSC))vol.21
L ye Hydrocyanation of phthal imido-alkynes catal yzed by nickel powder leads to mixtures of B- and Y-amino acids. l Y y Particular examples of synthesis targets include (8) -isoserine HHaCHaCH (OH)C02H, for which three independent studies claim the first enantioselective synthesis. (8)-Malic acid, ( 43 formed with (Ph0)2P(O)B3 and Et3B in refluxing benzene,200 or Curtius rearrangement of ( 44 1, 20' and (-1-8-phenylmenthyl glyoxylate m ~ n o h y d r a t e , are ~ ~ ~ the chosen starting materials.
245 Thus, a-nitro-a-methylalkanoate esters can be kinetically resolved using a-chynrotrypsin4* as a component of a general amino acid synthesis, and the same enzyme yields methyl L-phenylalaninate through catalyzing the asymmetric transesterif ication of n-propyl DL-phenylalaninate in &OH. 2a7 Further development of the use of chiral binaphthyl hosts that show high chiral recognition for phenylglycinates is reported,24sand conventional uses of resolving agents C (+l-l-phenylethanesulphonic acid and DL-z hydroxygly~ine;~~~ (+)-tartaric acid and E-salicylylidene-DL-thia~olidine-4carboxylic acid2"] have the added virtue that the L-enantiomer that remains in solution in these cases is epimerized.
Study. m. r. m. r, of a single crystal of I7O-enri ched glycine reveals five 170 transitions, each comprising two lines, each caused by a dipolar interaction between a 170 atom and nearest protons in the unit cell. m U a Circular m. d. c,d. 2s2 H-Bocand 2-amino acids have been studied by 15C-n. m,r. , and v. d. d, couplet in the carbonyl stretch wavelength region while "C-n, m. r. spectra indicate that the amide configuration is predominantly at room temperature. d. ~'~ This study, and a use of c,d.
Amino Acids and Peptides (SPR Amino Acids, Peptides (RSC))vol.21 by J. H. Jones