Kinetics and mechanism of mono- and di-olefin exchange at five-co-ordinate iron(0)
作者:Philip M. Burkinshaw、Denis T. Dixon、James A. S. Howell
DOI:10.1039/dt9800000999
日期:——
Exchange of various mono-olefins with styrene in [Fe(CO)4(PhCHCH2)] proceeds via a dissociative process, involving an Fe(CO)4 intermediate. Ligand exchange in system (i)(enone = benzylideneacetone, cinnamaldehyde, chalcone, or dypnone; polyene = cyclohexa- and cyclohepta-1,3-diene, cycloheptatriene, cycle-octatetraene, [Fe(CO)3(η4-enone)]+ polyene ⇌[Fe(CO)3(η4-polyene)]+ enone (i) or 1,4-diphenylbuta-1
各种单烯烃与苯乙烯在[Fe(CO)4(PhCH CH 2)]中的交换通过离解过程进行,涉及Fe(CO)4中间体。配体交换系统(ⅰ)(烯酮=亚苄基丙酮,肉桂醛,查耳酮,或dypnone;多烯= cyclohexa-和环庚-1,3-二烯,环庚三烯,循环octatetraene,的[Fe(CO)3(η 4 -enone) ] +多烯⇌的[Fe(CO)3(η 4-多烯)] +烯酮(i)或1,4-二苯基丁-1,3-二烯)是逐步的,包括速率确定的π-键合的CO部分的脱螯作用。缔合和解离途径都被发现。讨论了二烯结构和烯酮取代基的影响。