Catalytic Reduction of Phenyl-Conjugated Acetylenic Halides by Nickel(I) Salen: Cyclization versus Coupling
作者:Mohammad S. Mubarak、Theodore B. Jennermann、Michael A. Ischay、Dennis G. Peters
DOI:10.1002/ejoc.200700655
日期:2007.11
to study the catalytic reduction of five phenyl-conjugated haloalkynes by nickel(I) salen electrogenerated at carbon cathodes in dimethylformamide containing tetramethylammonium tetrafluoroborate. Electrocatalytic reduction of 7-bromo- and 7-iodo-1-phenyl-1-heptyne affords the carbocyclic product, benzylidenecyclohexane, in up to 41 % yield, whereas under similar conditions reduction of 5-halo-1-phenyl-1-pentyne
采用循环伏安法和可控电位电解法研究了在含有四甲基四氟硼酸铵的二甲基甲酰胺中,在碳阴极上电生的镍 (I) salen 对五种苯基共轭卤代炔烃的催化还原。7-溴-和 7-碘-1-苯基-1-庚炔的电催化还原得到碳环产物亚苄基环己烷,产率高达 41%,而在类似条件下,5-卤代-1-苯基-1-戊炔的还原和 8-bromo-1-phenyl-1-octyne 分别以非常低的产率 (≤1%) 得到亚苄基环丁烷和亚苄基环庚烷。二聚体、炔烃和炔烃是由苯基共轭卤代炔烃形成的其他产物。衍生自 5-halo-1-phenyl-1-pentyne 和 8-bromo-1-phenyl-1-octyne 的二聚体(二苯基链二炔)的产率为 85% 至 93%,而 1,14-diphenyltetradeca-1,13-diyne(由 7-halo-1-phenyl-1-heptyne 产生的二聚体)的产率为 45-51