Formation of a diazadiphosphetidine from the reactions of a bis(aminosilyl) ether with PCl₃: crystal structure of cis-[(Bu^tNH)PNBu^t]₂

Abstract

Reaction of O[SiMe₂N(Bu^t)H]₂ 1 with PCl₃ in 1∶1 molar ratio in hexane in presence of NEt₃ gave the cyclic four-membered diazadiphosphetidine cis-[(Bu^tNH)PNBu^t]₂ 2 instead of the expected six-membered silazoxyphosphine indicating cleavage of the Si–N bond. A crystal structure analysis of 2 showed that the NH hydrogens of the Bu^tNH groups are in an endo-endo orientation above the (PN)₂ ring which is in contrast to the exo-endo orientation for the known structure of its disulfide.

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