Mono- and disubstituted, nonstabilized methylenetriphenylphosphoranes 1 can be converted by transylidation with the monochlorophosphane 2 into the kinetically more stable phosphaalkenes 4. Probable intermediates in every case are the betaines 3. Aryl 2,4,6-tri-tert-butylphenyl.
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Märkl et al. (1989) studied this question.
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