The structure of the title compound has been determined. The crystals are monoclinic with a= 15·362, b= 9·483, c= 20·054 Å, β= 95° 6′, Z= 4, space group C2. 3292 Visually estimated X-ray reflections were refined to R 8·88%. There are two crystallographically independent molecules, each possessing a two-fold axis. The PCP angle is 143·8° in one of these molecules and 130·1° in the other. The results are compared with those obtained for related species, including the isoelectronic cation Ph3PNPPh3 and the cumulene ylides.
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Vincent et al. (1972) studied this question.
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