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Methods are described for the preparation in geometrically homogeneous form of allylic diphenylphosphine oxides. These compounds can be used in Horner reactions with carbonyl compounds to provide a convenient one-step synthesis of conjugated dienes in which the geometry present in the original allyl system is preserved. The method is exemplified by the preparation of the homogeneous Z-and €-forms of but-2-enylidenecyclohexane and of 3-methylpent-2-enylidenecyclohexane.

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153ChemInform Abstract The triethylamine-catalyzed reaction mentioned in the title gives comparable or better yields than the analogous methylation in the presence of tetrabutylammonium iodide.