Bis(η5-cyclopentadienyl)-2,4-bis(trimethylsilylethynyl)-3,5-bis(trimethylsilyl)titanacyclopenta-2,4-diene (1) and the seven-membered zirconacyclocumulene bis(η5-cyclopentadienyl)-2,4,7-tris(trimethylsilyl)-3-(trimethylsilylethynyl)zirconacyclohepta-2,4,5,6-tetraene (2) react with sulfur monochloride to yield an identical product, 2,4-bis(trimethylsilylethynyl)-3,5-bis(trimethylsilyl)thiophene (3). A one-to-one mixture of the homo- and heterobimetallic bis-σ,π-acetylide bridged complexes Cp2Ti(μ-η1:η2-CCSiMe3)M(μ-eta1:η2-CCSiMe3)Cp2 (M = Zr (4), M = Ti (5)) is formed in the reaction of zirconacyclocumulene 2 with three equivalents of Cp2Ti(η2-Me3SiCCSiMe3). The reaction proceeds most likely via alkyne elimination, a C-C-single bond activation, and the cleavage of the starting diyne takes place.
双(η5-环戊二烯基)-2,4-双(三甲基硅烷基)-3,5-双(三甲基硅烷基)钛杂环戊-2,4-二烯 (1) 和七元锆杂环戊烯双(η5-环戊二烯基)-2,4、7-三(三甲基硅烷基)-3-(三甲基硅烷基乙炔基)锆杂环庚-2,4,5,6-四烯 (2) 与一氯化硫反应,生成相同的产物 2,4-双(三甲基硅烷基乙炔基)-3,5-双(三甲基硅烷基)噻吩 (3)。锆合环茂林 2 与三当量的 Cp2Ti(η2-Me3SiCCSiMe3)反应,会形成同金属和异金属双-σ,π-乙酰基桥接复合物 Cp2Ti(μ-η1:η2-CCSiMe3)M(μ-eta1:η2-CCSiMe3)Cp2 的一对一混合物(M = Zr (4),M = Ti (5))。反应很可能是通过炔消除、C-C-单键活化和起始二炔裂解进行的。