INTERACTION OF KETO- AND TERTIARY AMINO-FUNCTION IN MEDIUM RINGS

Abstract

The ultraviolet and infrared absorption spectra of protopine and some of its derivatives have been studied. The interaction between a keto group and a tertiary nitrogen in a 10-membered ring is illustrated by the study of these spectra. On the basis of these studies a quaternary carbinolamine structure (V) is suggested for protopine and cryptopine salts. Some of the reactions of protopine, cryptopine, and vomicine are discussed.