Abstract
The coordination behavior of the imido derivatives of sulfur Me3SiNSE (E = O, NSiMe3) towards the 16-electron complex [CpCr(NO)2]BF4 has been studied. In both cases coordination through an η1-N linkage occurs as well as elimination of Me3SiF to afford the metalated derivatives Cp(NO)2CrNSE, which as N-nucleophiles are additionally bound to the also-formed electrophilic BF3 molecule (1, 2). Neither the possible addition products [Cp(NO)2Cr{N(SiMe3)SE}]BF4 as intermediates in the synthesis of 1, 2 nor the BF3-free derivatives Cp(NO)2CrNSE as elimination products of 1, 2 could be stabilized or generated. The molecular structures of 1, 2 have been determined by single crystal X-ray analyses. Both compounds contain a distorted tetrahedrally configured chromium center and an almost planar zig-zag conformation of their sulfinyl imido (F3BNSO) and sulfur diimido ligand (F3BNSNSiMe3), respectively.
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