952649-18-2Relevant academic research and scientific papers
Terminal carbido complexes of osmium: Synthesis, structure, and reactivity comparison to the ruthenium analogues
Stewart, Michael H.,Johnson, Marc J. A.,Kampf, Jeff W.
, p. 5102 - 5110 (2008/10/09)
The first terminal carbide complex of osmium, Os(≡C) (PCy3)2Cl2 (4), was synthesized via S-atom abstraction from Os(CS)(PCy3)2Cl2 (4-S) by Ta(OSi-f-Bu3)3 (7). Compound 4 reacts with HO3SCF3 (HOTf) to form the first cationic osmium methylidyne complex [Os(≡CH)(PCy3) 2Cl2][OTf] (18). The analogous ruthenium complex [Ru(≡CH)(H2IMeS)(PCy3)Cl2][OTf] is not observed upon protonation of Ru(≡C)-(H2IMeS)(PCy 3)Cl2 (2) with HOTf. Substitution of the chloride ligands in 4 is surprisingly difficult compared to the case of 4-S, but Os(≡C)(PCy3)2I2 can be obtained. Compound 4 also reacts with a variety of electrophiles to afford cationic five-coordinate and neutral six-coordinate carbyne complexes. In general, 4 reacts more readily with electrophiles than does 1, and cationic carbyne complexes formed from 4 are more resistant to degradation than are their Ru counterparts.
