Derivatives of Aromatic Sulfinic Acids. IV. The Absolute Configurations of Asymmetric Sulfur in Epimeric Sulfinic Esters1

1961 ◽  
Vol 83 (9) ◽  
pp. 2124-2128 ◽  
Author(s):  
Harry F. Herbrandson ◽  
Carmen M. Cusano
Keyword(s):  
Sulfinic Acids ◽  
The Absolute ◽  
Derivatives Of

Absolute configuration at C(20) of the derivatives of 21-nor-5α-cholane-20,24-diol

1980 ◽  
Vol 45 (9) ◽  
pp. 2443-2451
Author(s):  
Vladimír Pouzar ◽  
Miroslav Havel
Keyword(s):  
Absolute Configuration ◽  
Side Chain ◽  
Chemical Correlation ◽  
The Absolute ◽  
Derivatives Of

Derivatives of 21-nor-5α-cholane-20,24-diol XI and XIX were prepared by stepwise construction of the side-chain in the position 17β. Their absolute configuration at C(20) was determined on the basis of chemical correlation with the derivatives of 21-nor-5α-cholan-20-ol, XVI and XXIV. The absolute configuration of alcohols XVI and XXIV was determined from the ratio of the yields in which they are formed during the reduction of ketone X and using the benzoate rule. To compounds XI-XVIII the configuration 20R and to compounds XIX-XXVI the configuration 20S has been assigned.

scholarly journals Circular Dichroic Properties of Flavan-3-ols

1999 ◽  
Vol 23 (7) ◽  
pp. 450-451
Author(s):  
Hendrik van Rensburg ◽  
Petrus J. Steynberg ◽  
Johann F. W. Burger ◽  
Pieter S. van Heerden ◽  
Daneel Ferreira
Keyword(s):  
Absolute Configuration ◽  
Heterocyclic Ring ◽  
The Absolute ◽  
Derivatives Of ◽  
Circular Dichroic

CD data of all four diastereoisomers of the permethylaryl ether 3- O-acetyl derivatives of a series of flavan-3-ols permit assignment of the absolute configuration at the stereocentres of the heterocyclic ring.

Derivatives of Aromatic Sulfinic Acids. II. The Reaction of Thionyl Chloride with Sulfinic Esters1,2

1956 ◽  
Vol 78 (11) ◽  
pp. 2576-2578 ◽  
Author(s):  
Harry F. Herbrandson ◽  
Richard T. Dickerson ◽  
Julius Weinstein
Keyword(s):  
Thionyl Chloride ◽  
Sulfinic Acids ◽  
Derivatives Of

scholarly journals Synthesis of enantiomerically enriched (R)-13C-labelled 2-aminoisobutyric acid (Aib) by conformational memory in the alkylation of a derivative of L-alanine

2011 ◽  
Vol 7 ◽  
pp. 1304-1309 ◽  
Author(s):  
Stephen P Fletcher ◽  
Jordi Solà ◽  
Dean Holt ◽  
Robert A Brown ◽  
Jonathan Clayden
Keyword(s):  
Amino Acids ◽  
Absolute Configuration ◽  
Enantiomeric Purity ◽  
Methyl Groups ◽  
Aminoisobutyric Acid ◽  
The Absolute ◽  
Conformational Memory ◽  
Enantioselective Alkylation ◽  
Derivatives Of

The method of Kouklovsky and coworkers for the enantioselective alkylation of cyclic N-naphthoyl derivatives of amino acids was used to introduce a 13C label into one of the two enantiotopic methyl groups of 2-aminoisobutyric acid (Aib) by retentive alkylation of L-alanine with 13CH3I. Conditions were identified for optimization of yield and enantiomeric purity, and the absolute configuration of the labelled product was established.

On the absolute configurations of some synthetic side chain derivatives of 18β -olean-11-on-12-enes

1973 ◽  
Vol 14 (46) ◽  
pp. 4611-4614
Author(s):  
Sh. Rozen ◽  
I. Shahak ◽  
E.D. Bergmann
Keyword(s):  
Side Chain ◽  
The Absolute ◽  
Derivatives Of
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