Negishi cross-coupling has been applied to B−I and B−Br bonds in small closo-ferracarboranes as a means of effecting controlled substitution at boron, with subsequent linkage to form polymetallacarborane systems. Reaction of (η6-C6H6)Fe(2,3-Et2C2B4H3-5-I) (2) with vinyl−, butyl−, (trimethylsilyl)ethynyl−, and phenyl−organozinc reagents (RZnCl) in the presence of catalytic amounts of palladium(0) catalyst
Negishi交叉偶联已经施加到B-I和B-
溴在小键闭合碳-ferracarboranes如
硼实现受控置换,随后联动形式polymetallacarborane系统的手段。(η的反应6 -C 6 H ^ 6)的Fe(2,3--ET 2 c ^ 2乙4 ħ 3 -5-I)(2)与
乙烯基- ,丁基- ,(三甲
硅烷基)
乙炔基,和苯基-
有机锌试剂(RZnCl)在催化量的
钯的存在(0)催化剂产生的相应的B-官能衍
生物(3 - 5和8在中等至良好的产率,分别地)。同样,(η由B(7)-Br(11a)或B(7)-I衍
生物(6 -C 6 H 6)Fe(Et 2 C 2 B 4 H 3 -7-C⋮CSiMe 3)(12)11b)。在12的B(5)处引入第二个炔基片段,以产生B(5,7)-二
乙炔基取代的化合物16。的治疗(η 6 -C 6 H ^ 6)的Fe(2,3--ET 2 c ^ 2乙4 ħ 3 -5-