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The phosphasilenes Is2SiPR (Is = 2,4,6-tri-isopropylphenyl, R = SiMe2tBu, SiiFr3) are remarkably thermally stable. At about 60°C, they react with white phosphorus to give the 1,2,3-triphospha-4-silabicyclo[ 1.1.0]butanes 1. Compounds with P3Si framework thus join the known P4, Si4, and P2Si2 heterobicyclobutanes.
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Matthias Drieß (1991) studied this question.
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