On the reported optical activity of amino acids in the Murchison meteorite (reply)

Nature ◽  
1983 ◽  
Vol 301 (5900) ◽  
pp. 496-497 ◽  
Author(s):  
Michael H. Engel ◽  
Bartholomew Nagy
Keyword(s):  
Amino Acids ◽  
Optical Activity ◽  
Murchison Meteorite

On the reported optical activity of amino acids in the Murchison meteorite

Nature ◽  
1983 ◽  
Vol 301 (5900) ◽  
pp. 494-496 ◽  
Author(s):  
Jeffrey L. Bada ◽  
John R. Cronin ◽  
Ming-Shan Ho ◽  
Keith A. Kvenvolden ◽  
James G. Lawless ◽  
...  
Keyword(s):  
Amino Acids ◽  
Optical Activity ◽  
Murchison Meteorite

Outer-sphere interaction of (S)-asparagine and (S)-glutamine with [Co(NH3)6]3+ ion and its possible role in ligand substitution

1987 ◽  
Vol 52 (10) ◽  
pp. 2457-2459
Author(s):  
František Jursík
Keyword(s):  
Amino Acids ◽  
Transition Region ◽  
Alkaline Medium ◽  
Optical Activity ◽  
Substitution Reaction ◽  
Outer Sphere ◽  
Ligand Substitution ◽  
Cotton Effect ◽  
Negative Cotton Effect

Optical activity of the achiral cation [Co(NH3)6]3+ is induced both by (S)-AsnONa and (S)-GlnONa, as shown by a negative Cotton effect in the 1A1g → 1T1g transition region. An outer-sphere interaction by three-point attachment of the amides can explain the fact that substitution reaction of [Co(NH3)6]3+ with the mentioned amides in an alkaline medium is unusually slow as compared with other amino acids.

ChemInform Abstract: OPTICAL ACTIVITY OF MIXED COMPLEXES OF COPPER(II) AND AMINO ACIDS IN THE VISIBLE REGION

1976 ◽  
Vol 7 (8) ◽  
pp. no-no
Author(s):  
L. GIL ◽  
E. MORAGA ◽  
H. BOBADILLA ◽  
S. BUNEL ◽  
C. A. BUNTON
Keyword(s):  
Amino Acids ◽  
Optical Activity ◽  
Visible Region ◽  
Mixed Complexes

The 2,2,2-Trichloroethyl Group for Carboxyl Protection During Peptide Synthesis

1973 ◽  
Vol 51 (2) ◽  
pp. 208-214 ◽  
Author(s):  
Bernard Marinier ◽  
Yoon C. Kim ◽  
Jean-Marie Navarre
Keyword(s):  
Amino Acids ◽  
Acetic Acid ◽  
Peptide Synthesis ◽  
Optical Activity ◽  
Selective Removal ◽  
Acid Chlorides ◽  
Protecting Group

The 2,2,2-trichloroethyl esters of several N-carbobenzoxy-amino acids were prepared by reacting the corresponding acid chlorides with trichloroethanol and the carbobenzoxy groups were selectively removed by HBr–AcOH. The resulting esters were then coupled with various N-carbobenzoxy-amino acids or peptides using dicyclohexylcarbodiimide in acetonitrile to give N-carbobenzoxy-peptide trichloroethyl esters. The selective removal of the trichloroethyl protecting group was effected by reduction using zinc in acetic acid. The optical activity of the N-carbobenzoxy-peptides so obtained agreed well with the values reported in the literature. The overall results suggest that the 2,2,2-trichloroethyl group could be useful for carboxyl protection during peptide synthesis.

scholarly journals Enzymatic Studies on the Optical Activity of Amino Acids. Part IX

1962 ◽  
Vol 36 (3) ◽  
pp. 237-239
Author(s):  
Masao TANAKA ◽  
Yo KATO ◽  
Shukuo KINOSHITA
Keyword(s):  
Amino Acids ◽  
Optical Activity
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