Metallaborane Reactivity. A Stoichiometric Mechanism for the Insertion of Two Alkynes into an Iridaborane Framework via a Disposable Molybdenum Chaperone
作者:Frédéric de Montigny、Ramón Macias、Bruce C. Noll、Thomas P. Fehlner、Karine Costuas、Jean-Yves Saillard、Jean-François Halet
DOI:10.1021/ja068999z
日期:2007.3.1
was monitored by 1H and 11B NMR and showed the formation and decay of two additional species which have been identified as the structural isomers [1-Cp*-7,7,7-(CO)3-7-THF-2,3-(CH3)2-nido-1,7,2,3-IrMoC(2)B(3)H(5)], 4, and [5-Cp*-7,7,7-(CO)3-7-THF-2,3-(CH3)2-nido-5,7,2,3-IrMoC(2)B(3)H(5)], 5, with the metals nonadjacent in 4 and adjacent in 5. Circumstantial evidence suggests that 4 is the precursor to
建立在早期工作的基础上,这些工作表明 [1-Cp*-2,2,2-(CO)3-2-THF-nido-1,2-IrMoB(4)H(8)], 2,来自[1-Cp*-arachno-1-IrB(4)H(10)], 1, 与(芳烃)Mo(CO)3 的反应,生成 [1-Cp*-5,6 的化学计量机制,7,8-(R)4-nido-1,5,6,7,8-IrC(4)B(3)H(3)], 8, 来自 2 与 RCCR 的反应, R = Me,博士,已确定。对于 R = Me,溶液中的主要产物是 [1-Cp*-5,6,7,8-(CH3)4-closo-1,5,6,7,8-IrC(4)B(3) H(3)Mo(CO)3], 7,与 8 处于平衡状态。 平衡 8 + Mo(THF)3(CO)3 <==> 7 + 3THF 的特征在于 DeltaH = 8 kcal/mol 和DeltaS = 34 cal/mol K。在