Steric Effects. Internal-Rotation of 1-Aryl-8-Phenylnaphthalenes

Abstract

A general, albeit low-yielding, synthesis of 1-aryl-8-phenylnaphthalenes was devised and used to prepare three l-(3'-X-5'-isopropylphenyl)-8-phenylnaphthalenes (X = H, F, Br). Activation parameters for the rotation of the 3'-X-5'4sopropylphenyl group were determined by dynamic m.m.r. spectroscopy.