
TY  - JOUR
A1  - Cambie, RC 
A1  - Crump, DR 
A1  - Denny, WA 
A1  - Fullerton, TJ 
T1  - Chemistry of the Podocarpaceae. XXXII. Stereochemistry of 6-Bromo-7-oxo derivatives of ring-c aromatic diterpenoids
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1971
VL  - 24
IS  - 6
SP  - 1237
EP  - 1250
KW  - 
UR  - https://doi.org/10.1071/CH9711237 
N2  - The stereochemistry of 6-bromo-7-oxo derivatives of diterpenoids possessing an aromatic ring c is discussed. Nan-stereospecific bromination of 7-oxo diterpenoids occurs for compounds with an unactivated aromatic ring provided that no methoxycarbonyl substituent is at C 4. It also occurs for a C 19 acetate providing an activating substituent is present at C 12, but not for compounds with a C 4 methoxycarbonyl group even if they possess a C 12 activating substituent. The assignment of configuration of 6-bromo substituents from nuclear magnetic resonance and nuclear Overhauser effect data is examined and limitations to the use of optical rotatory dispersion curves are discussed. 
ER  -

