Phosphorylphosphane complexes 1 are the ideal starting compounds for the preparation of “phospha-Wittig” reagents 2, which react with aldehydes and ketones to give the corresponding phosphaalkene complexes 3. These can be isolated directly or after trapping with, for example, MeOH or cyclopentadiene. Liberation of the phosphaalkene from 3 should also be possible. R = Me, Ph.
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Marinetti et al. (1988) studied this question.
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