Relationships between the torsion angles in seven-membered rings

Abstract

A relationship between torsional angles in seven-membered rings has been proved by its application to several experimental and theoretically computed geometries. This general formula, with two phase angles, is reduced to that proposed by Flapper and Romers, with a single phase angle, when dlly conformations belonging to symmetrical pathways are considered. However, for distorted conformations the general formula provides far better results.