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.

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