Reactions of [CpM(CO)3]2 (M = Mo, W) with Ph3SnSR: formation of CpM(CO)3(SnPh3) and CpM(CO)2(κ2-SR) via Sn–S bond cleavage
摘要:
The mixed-metal compounds CpM(CO)(3)(SnPh3) (1, M=Mo; 2, M=W) are obtained as the only isolable products from the reactions of [CpM(CO)(3)](2) with PhSSnPh3, whereas similar reactions with pymSSnPh(3) (pymS=pyrimidine-2-thiolate) lead to the formation of chelate compounds CpM(CO)(2)((2)-pymS) (3, M=Mo; 4, M=W). Separate experiments show that CpM(CO)(3)(SnPh3) are precursors of CpM(CO)(2)((2)-pymS). CpM(CO)(3)(SnPh3) can also be synthesized in slightly improved yield from the direct reaction between [CpM(CO)(3)](2) and Ph3SnH, while the yield of CpM(CO)(2)((2)-pymS) becomes negligible when [CpM(CO)(3)](2) is treated with pymSH.