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Wittig Reaction; Horner ReactionHorner-Wadsworth-Emmons Reaction

Alkene formation from carbonyl compounds and phosphonium ylides, proceeding primarily through the proposed betaine and/or oxaphosphetane intermediates. The stereoselectivity can be controlled by the choice of ylide, carbonyl compound, and reaction conditions:

Wittig Reaction; Horner ReactionHorner-Wadsworth-Emmons Reaction

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