Phosphoranylidenephosphines DmpPPMe3 (1a, Dmp = 2,6-Mes2C6H3) and Mes*PPMe3 (1b, Mes* = 2,4,6-But3C6H2) act as ‘Phospha-Wittig’ reagents with aldehydes providing phosphaalkenes [ArPC(H)R] in high yields.
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Shah et al. (1998) studied this question.
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