The 16e half-sandwich complex Cp*Co(S2C2B10H10)(1, Cp* = pentamethylcyclopentadienyl) reacts with N-1-naphthylpropargylamide to afford two 18e complexes (2) and (3). 2 is a 1 : 1 adduct containing a four-membered metallacycle. In 3 the alkyne is twofold inserted into one Co–S bond in a head–head mode. Reactions of 1 with 1-(2-furyl)-2-propyn-1-one and 1-ferrocenyl-2-propyn-1-one lead to two types of alkyne twofold inserted products (4)/(5) and (6)/(7), respectively. The reaction of 1 with phenylacetylene gives rise to the sole complex (8) of the same structural type as 3, 4 and 6, whereas the reaction of 1 with dimethyl acetylene dicarboxylate affords the sole 1 : 1 adduct (9). Complexes 2–9 have been characterized by IR, NMR, elemental analysis and mass spectrometry, and 3–9 have also been determined by single-crystal X-ray diffraction analysis.
16e 半夹心配合物 Cp*Co(S2C2B10H10)(1, Cp* = 五
甲基环戊二烯基) 与 N-1-
萘基炔丙基酰胺反应,得到两个 18e 配合物 (2) 和 (3)。 2是含有四元
金属环的1 : 1加合物。在 3 中,
炔烃以头对头模式双重插入到一个 Co-S 键中。 1与1-(2-
呋喃基)-2-
丙炔-1-一和1-
二茂铁基-2-
丙炔-1-一的反应产生两种类型的炔双插入产物(4)/(5)和(6 )/(7) 分别。 1与
苯乙炔的反应产生与3、4和6具有相同结构类型的唯一配合物(8),而1与
乙炔二
甲酸二甲酯的反应产生唯一的1 : 1加合物(9)。配合物2-9已通过IR、NMR、元素分析和质谱进行了表征,3-9也已通过单晶X射线衍射分析进行了测定。