Addition reactions of heterocyclic compounds. Part LIV. Rotational isomerism of 6-aralkyl-5-oxidovinylphenanthridiniums: an investigation by variable temperature nuclear magnetic resonance spectroscopy
Abstract
6-Aralkyl-5-oxidovinylphenanthridiniums have been synthesised and shown to exhibit rotational isomerism by variable temperature nuclear magnetic resonance spectroscopy. The oxidovinyl compounds obtained from 6-benzylphenanthridine 5-oxide and methyl propiolate or dimethyl acetylenedicarboxylate have been converted into 1-phenylpyrrolo[1,2-f]phenanthridines.