作者:Juri Möbus、Gerald Kehr、Constantin G. Daniliuc、Roland Fröhlich、Gerhard Erker
DOI:10.1039/c3dt52373j
日期:——
Two (aryl)PXY starting materials (aryl = mesityl or 2,4,6-triisopropylphenyl; X,Y = Cl, Br) were reacted with lithiated conjugated enynes (derived from 2-methylbutenyne or 1-ethynylcyclohexene) to yield the respective (aryl)bis(enynyl)phosphanes. Their reaction with HB(C6F5)2 gave the heterocyclic five-membered zwitterionic borataâdiene compounds containing the aryl group and one unchanged enynyl substituent at phosphorus. The borataâalkene products were thought to arise from a two step process of regioselective alkyne hydroboration followed by an internal phosphane attack on the boryldiene unit. Three examples of the ring-closed borataâalkene type products were characterized by X-ray diffraction.
两种(芳基)PXY起始材料(芳基 = 美克斯基或2,4,6-三异丙基苯;X,Y = Cl, Br)与锂化共轭烯炔(源自2-甲基丁炔或1-乙炔基环己烯)反应,生成相应的(芳基)双(烯炔)膦。它们与HB(C6F5)2反应生成包含芳基和一个未改变的烯炔取代基的异环五元内盐双硼烯化合物。这些硼烯-烯烃产品被认为是通过选择性炔烃氢硼化的两步过程生成的,随后是对硼烯单元的内部膦攻击。通过X射线衍射对三种环闭合的硼烯-烯烃类型产品进行了表征。