The structurally characterised silyl complexes, Os(κ2-S2CNMe2)(SiMeCl2)(CO)(PPh3)2 and Os(κ2-S2CNMe2)(SiCl3)(CO)(PPh3)2, which have remarkably unreactive Si–Cl bonds

Treatment of Os(κ2-S2CNMe2)H(CO)(PPh3)2 with HSiMeCl2 or HSiCl3 gives in high yield Os(κ2-S2CNMe2)(SiMeCl2)(CO)(PPh3)2 (1) or Os(κ2-S2CNMe2)(SiCl3)(CO)(PPh3)2 (2), respectively. The crystal structures of both compounds have been determined and the Os–Si distances are 2.3672(10) Å for 1 and 2.3449(12) Å for 2. In solution, and under forcing conditions, both compounds are extraordinarily unreactive towards hydroxide ions.

Os(κ2-S2CNMe2)(SiMeCl2)(CO)(PPh3)2 or Os(κ2-S2CNMe2)(SiCl3)(CO)(PPh3)2 result from treatment of Os(κ2-S2CNMe2)H(CO)(PPh3)2 with either HSiMeCl2 or HSiCl3, respectively. The crystal structures of both silyl complexes have been determined and in solution both compounds are extraordinarily unreactive towards hydroxide ions, even under forcing conditions.Figure optionsDownload as PowerPoint slide