2,4,6-Tri-tert-butyl-1,3,5-triphosphabenzene 1 undergoes [1 + 4]-cycloaddition with the stable bis(amino)silylenes Si[(NCH2But)2C6H4-1,2] 3, Si[(NBut)2C2H2] 4 and Si[(NBut)2C2H4] 7 to afford the structurally characterised 5, 6 and 11. The intermediate aminosilylsilylene resulting from the dissociation of the disilene [Si(NBut)2C2H4}]49 was trapped as its [1 + 4]-cycloadduct with 1,
which was also structurally characterised. The reversibility of the cycloaddition was demonstrated for 5 through reaction with [Mo(CO)4(nbd)] to afford [Mo(CO)3(η6-P3C3But3)] (13) and a mixture of cis- (14a) and trans-[Mo(CO)4(3)2] (14b) of which 14b has been structurally characterised by a single crystal X-ray diffraction study.
2,4,6-三叔丁基-1,3,5-
三磷酸苯 1 与稳定的双(
氨基)
硅烷基 Si[(NCH2But)2C6H4-1,2] 3、Si[(NBut)2C2H2] 4 和 Si[(NBut)2C2H4] 7 发生[1 + 4]-环加成反应,得到结构上特征明显的 5、6 和 11。由
二苯乙烯[Si(NBut)2C2H4}]49 解离产生的中间
氨基
硅烷与 1 的[1 + 4]环加载产物被捕获,并对其进行了结构表征。通过与[Mo(CO)4(nbd)]反应得到[Mo(CO)3(η6-P3C3But3)](13)和顺式(14a)与反式[Mo(CO)4(3)2](14b)的混合物,证明了 5 环加成的可逆性,其中 14b 已通过单晶 X 射线衍射研究确定了结构特征。