Grignard compound derived from isopropyl mesityl ketone containing trico-ordinate magnesium

Abstract

Evidence from cryoscopic determinations in naphthalene and benzene, elemental and hydrolytic analyses, i.r. and ¹H n.m.r. spectra shows that the Grignard compound from isopropyl mesityl ketone orginally prepared by Fuson and his co-workers in 1939 is a monomeric enolate (III) containing trico-ordinate magnesium in contrast to the dimeric structure (I) found for the corresponding halogeno-derivatives from methyl mesityl ketone.