
TY  - JOUR
A1  - Clark-Lewis, JW 
A1  - Jackman, LM 
A1  - Spotswood, TM 
T1  - Nuclear magnetic resonance spectra, stereochemistry, and conformation of flavan derivatives
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1964
VL  - 17
IS  - 6
SP  - 632
EP  - 648
KW  - 
UR  - https://doi.org/10.1071/CH9640632 
N2  - Chemical-shift and coupling-constant data for protons in 68 flavan derivatives are reported.   Coupling-constant data for interactions involving the 2-, 3-, and 4-protons have been used to define the configuration of the 2-, 3-, and 4-substituents and the conformation of the heterocyclic ring. It is shown that chemical-shift data for protons of the heterocyclic ring and of 3- and 4-acetoxyl groups are of little value in stereochemical studies.   Analysis of the absorptions of the aromatic protons shows that N.M.R. is useful for determining the oxygenation pattern in rings A and B. 
ER  -

