Addition reactions of heterocyclic compounds. Part XXXIII. New adducts from some pyridines and dimethyl acetylenedicarboxylate
Abstract
1:2 and 1:3 Adducts have been obtained from both 2-phenyl- and 2-vinyl-pyridine with dimethyl acetylenedicarboxylate, and their structures deduced largely from nuclear magnetic resonance spectra. The adducts from 2-phenylpyridine possess one very high-field ester resonance due to shielding by the phenyl ring.