Reductive Coupling of Carbon Monoxide in a Rhenium Carbonyl Complex with Pendant Lewis Acids
Miller, Alexander J. M.
Labinger, Jay A.
Bercaw, John E.
- Publisher: American Chemical Society
Caltech Library Services
Phosphinoborane ligands impart unique reactivity to a rhenium carbonyl cation relative to simple phosphine complexes. Addition of either triethylborohydride or a platinum hydride (that can be formed from H2) forms a rhenium boroxycarbene. This carbene, which crystallizes as a dimer, disproportionates over a period of days to afford the starting cation and a structurally unprecedented boroxy(boroxymethyl)carbene, in which a new C−C bond has been formed between two reduced CO ligands. This product of C−C bond formation can be independently synthesized by addition of 2 equiv of hydride to the rhenium carbonyl cation.