When 1-(pentaphenylphenyl)-2-phenylacetylene (1) is heated with (η5-cyclopentadienyl)dicarbonylcobalt, 1,2,3,4-tetraphenylfluorene (3) and related minor products are formed rather than the expected tetraarylcyclobutadiene. The formation of 3 requires that a seven-carbon fragment (formally a phenylcarbyne) must be lost. Two minor products, however, result from intramolecular cyclization of the alkyne
当1-(pentaphenylphenyl)-2-
苯乙炔(1)与加热(η 5 -
环戊二烯基)dicarbonylcobalt,1,2,3,4- tetraphenylfluorene(3)和相关的次要产物形成而不是预期的tetraarylcyclobutadiene。3的形成要求必须丢失7个碳原子的片段(正式名称为phenylcarbyne)。然而,两种次要产物是由
炔烃的分子内环化产生的,并且这两种保留了起始原料中的所有碳。