Carbamoylation of Aryl Halides by Molybdenum or Tungsten Carbonyl Amine Complexes
作者:Wei Ren、Motoki Yamane
DOI:10.1021/jo1002592
日期:2010.5.7
When aryl halide is treated with molybdenumcarbonyl amine complex in the presence of base, carbamoylation proceeds to give amide in good yield. The proposed mechanism involves oxidativeaddition of aryl halide to molybdenum(0) complex, migratory insertion to carbon monoxide giving acyl(amino)molybdenum(II) or aryl(carbamoyl)molybdenum(II) intermediate, and reductive elimination of the amide. This
Palladium-Catalyzed Carbamoylation of Aryl Halides by Tungsten Carbonyl Amine Complex
作者:Wei Ren、Motoki Yamane
DOI:10.1021/jo901486z
日期:2009.11.6
In the presence of aminepentacarbonyltungsten, base, and a catalytic amount of palladium(0) complex, carbamoylation of aryl halide proceeds to afford amide. The reaction may involve transmetalation between palladium(II) intermediate and carbamoyltungstenate that is generated in situ. This catalytic cross-coupling reaction provides an alternative method to the conventional palladium-catalyzed amidation
Studies of the rates of reaction of the GroupVI-Bmetal hexacarbonyls (M = Cr, Mo, W) with benzylamine, cyclohexylamine and aniline (amine) support a rate law, −d[M(CO)6] /dt = k1[M(CO)6] + k2[M9CO)6] [amine]. The rate law is suggestive of two competing mechanisms, with the amine-independent path involving rate-determining dissociation of CO followed by amine uptake (D). The remarkable parallelism
VI-B族六羰基金属(M = Cr,Mo,W)与苄胺,环己胺和苯胺(胺)的反应速率研究支持速率定律,-d [M(CO)6 ] / dt = k 1 [M(CO)6] + k 2 [M9CO)6] [胺]。速率定律提示了两种竞争机制,其中与胺无关的途径涉及速率确定CO的解离和随后的胺吸收(D)。三种金属的竞争过程在速率上的显着平行性表明,相同的因素会影响每种途径的反应速率。Mo(CO)6反应的活化参数苄基胺,速率对胺依赖路径对各种传入亲核试剂的身份的相对不敏感性,支持了一种机制(Id,其中M-CO键的断裂非常重要。二阶速率的比较胺,膦和亚磷酸酯的反应常数表明在过渡态中用于后者的取代反应的τ-相互作用相对较小。
Halogen oxidation of some group VI metal carbonyl derivatives
作者:S.C. Tripathi、S.C. Srivastava、A.K. Shrimal
DOI:10.1016/s0020-1693(00)95609-3
日期:1976.1
Halogen oxidation of several amine chromium and amine molybdenum carbonyls has been studied. The species isolated were Cr(CO)3(amine)X2, Mo(CO)4 (amine)X2, Mo(CO)3(amine)2X2, Mo(CO)2(amine)2X2 and [Mo(CO)3(amine)3X]X (X = halogen). (1-Diphenylphosphino-2-diphenylarsinoethane)metal tetracarbonyls (metal = Cr, Mo, W) after reaction with halogens gave [Cr(CO)4(1-diphenylphosphino-2-diphenylarsinoethane)I]I
已经研究了几种胺铬和胺钼羰基的卤素氧化。分离出的物种是Cr(CO)3(胺)X 2,Mo(CO)4(胺)X 2,Mo(CO)3(胺)2 X 2,Mo(CO)2(胺)2 X 2和[Mo(CO)3(胺)3 X] X(X =卤素)。与卤素反应后的(1-二苯基膦基-2-二苯基ar氨基乙烷)金属四羰基化合物(金属= Cr,Mo,W)得到[Cr(CO)4(1-二苯基膦基-2-二苯基ar氨基乙烷)I] I,M(CO)3( 1-二苯基膦基-2-二苯基ar基乙烷)X 2(M = Mo,W; X = Br,I)和M(CO)2(1-二苯基膦基-2-二苯基ar氨基乙烷)Cl 2(M = Mo,W)。配合物已经通过微分析,红外光谱和电导率测量进行了鉴定。