Correlation of ring-junction stereochemistry in A-aromatic octahydrophenanthrenes with 13C n.m.r. chemical shifts
Abstract
More than twenty synthetic derivatives of structurally established A-aromatic octahydrophenanthrenes were examined by 13C n.m.r. Empirical observations were made on the experimental chemical-shift trends at C-1, C-6, C-9, and C-10, which are sufficiently characteristic to allow probable assignment of the stereochemistry of the B/C ring junction.