at the five-membered organic ring which is co-ordinated as a µ-alkylidene to the metal atoms which carry a formal negative charge. In solution the compound exists as two slowly interconverting isomers, 1a and 1b, which were separated by TLC and which differ only in the substitution position of the phosphonium group. Decarbonylation gives the compound [Os3(µ-H)(µ3-Ph3PC5H3)(CO)9]2, which also exists as
团簇[OS 3(CO)10(MeCN)2 ]在室温下与
环戊二烯基亚乙基
三苯基膦(Ph 3 PC 5 H 4)快速反应,得到氧化加成化合物[OS 3(µ-H)(µ-Ph 3 PC)通过X射线结构测定显示为5 H 3)(CO)10 ] 1含有C 5。通过一个碳原子与两个原子键合的环 我们认为该化合物是两性离子的,在五元有机环上具有一个substituent取代基,该五元有机环与一个带有正式负电荷的
金属原子配成µ-亚烷基。在溶液中,该化合物以两种缓慢互变的异构体1a和1b的形式存在,它们通过TLC分开并且仅在the基的取代位置上不同。脱羰得到化合物[OS 3(µ-H)(µ 3 -Ph 3 PC 5 H 3)(CO)9 ] 2,也以异构体形式存在。的主要异构体示出了X射线结构它以包含Ç 5环通过两个协调三个
锇原子σOS-C键和η 2键。两性离子描述同样是合适的。这些化合物中的键合表明了新型的
环戊二烯基(C