Unusual Reactivity of Methylphosphaalkyne (P≡CMe) toward Digermenes and Distannenes: Stepwise Formations of Bridged 2,3,5,6-Tetraphospha-1,4-dimethylidenecyclohexanes
作者:Cameron Jones、Christian Schulten、Andreas Stasch
DOI:10.1021/ic700926u
日期:2008.2.18
Reactions of methylphosphaalkyne, PCMe, with a digermene, R'' 2GeGeR'' 2 (R'' = -CH(SiMe 3) 2), and two distannenes, R'' 2SnSnR'' 2 and Ar' 2SnSnAr' 2 (Ar' = C 6H 2Pr (i) 3-2,4,6), have given moderate to high yields of the first bridged 2,3,5,6-tetraphospha-1,4-dimethylidenecyclohexanes, [R 2EC(Me)(H)PC(CH 2)P}] 2 (R = R'' or Ar', E = Sn or Ge), all of which have been structurally characterized. Their
甲基磷炔烃PCMe与Digermene R''2GeGeR''2(R''= -CH(SiMe 3)2)和两个二萘烷R''2SnSnR''2和Ar'2SnSnAr'2(Ar '= C 6H 2Pr(i)3-2,4,6),给出了第一个桥接的2,3,5,6-四磷-1,4-二甲基亚环己烷,[R 2E C(Me )(H)PC(CH 2)P}] 2(R = R″或Ar′,E = Sn或Ge),所有这些均已在结构上表征。据认为,它们的形成机理涉及连续的[2 +1]和[2 + 2]磷炔烃环加成,杂环重排,磷烯烃/乙烯基膦互变异构化和分子间加氢磷酸化反应。在一个反应中,已分光镜下观察到了两种中间体,并且一种通过配位被捕获到一个或两个W(CO)5片段中,产生第一二磷杂戊烯醚络合物,[W(CO)5} 1or2 R''2Ge [C(Me)PC(Me)P]}],已对其进行了结构表征。突出显示了PCMe和PCBu(t)的反应性之间的差异。