Synthesis of 2,4′-disubstituted biphenyls via regioselective electrophilic and nucleophilic addition to the (η5-cyclo- hexadienylidene)2[Cr(CO)3]2 dianion
作者:Sheng Sheng Yang、Bryan T. Dawson、Reuben D. Rieke
DOI:10.1016/s0040-4039(00)92701-1
日期:1991.7
(η5-Cyclohexadienylidene)2[Cr(CO)3]2 dianion (2) reacts regioselectively with primary alkyl bromides to produce an intermediate [μ-6-alkyl-6-(η6-phenyl)(1-5-η5)-cyclohexadienyl]bis- (tricarbonylchromium) anion (3). Treatment of intermediates 3 with cyano-stabilized anions, followed by oxidation with I2, resulted in the formation of 2,4 ′-dlsubstitoted biphenyl compounds in good yield. If the initially