All articles of this category Reaction of iodo Wittig ylide 1 with aldehyde 2 affords moderate yields of cis epoxides 6a and 7a , in addition to the expected olefin 3 . A mechanism is proposed to account for both the high Z selectivity and the modest yield of olefin observed with this reagent. Z -olefination - iodo Wittig ylids - α , β -epoxy phosphonium salts
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Arimoto et al. (1998) studied this question.