The base-stabilized bis-silylene (LSi-SiL, L = PhC(NtBu)1) was reacted with benzophenone in a 1:2 ratio in THF, which afforded a Si2O2 four-membered ring, stabilized by bulky amidinato ligands. The most striking phenomenon is the abstraction of oxygen from benzophenone and the simultaneous formation of a silicon carbon bond. The four-membered Si2O2 ring is planar, and both the silicon atoms are five-coordinate. The two silicon atoms are arranged opposite each other in the four-membered Si2O2 ring. Moreover LSi-SiL was treated with N2O to afford two four-membered Si3O, rings connected with two oxygen atoms. In this structure also the silicon atoms are five-coordinate.
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