Synthesis, structure, and reactivity of a 4-oxo-η3-cyclohexenyl molybdenum complex; diastereofacial selectivity in the reactions of the derived lithium enolate

Abstract
Nucleophilic attack on the 1,3-diene cation formed by reaction of 1-methoxycyclohexa-1,3-diene with [Mo(NCMe)2(CO)2(η5-C9H7)][BF4] leads to demethylation and formation of the crystallographically identified 4-oxo-η3-cyclohexenyl complex [Mo(η3-C6H7O)(CO)2(η5-C9H7)], which is attacked by electrophiles on the oxygen of the oxo-η3-allyl, and forms an E-enolate on deprotonation which reacts selectively with Mel, Etl, and PhCHO on the opposite face of the C6 ring to which the molybdenum is co-ordinated.

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