从[TaCp * Cl 4 ]与3当量的LiNH t Bu的反应中分离出亚氨基-酰胺基络合物[TaCp *(N t Bu)Cl(NH t Bu)] 1。通过[TaCp *(N t Bu)Cl 2 ]的甲基化获得二甲基[TaCp *(N t Bu)Me 2 ] 2和氯甲基[TaCp *(N t Bu)ClMe] 3的配合物。分别具有2当量的LiMe和1当量的ZnMe 2。的复杂的复分解反应3 M =锂,X = O;具有碱金属盐MX(M =钠,X = OME吨卜,NH吨Bu)提供了新的亚氨基甲基化合物[TaCp *(N t Bu)MeX](X = OMe 4,O t Bu 5,NH t Bu 6)。CNR的插入(R = 2,6-ME 2 ç 6 ħ 3)插入的Ta-NH吨的亚氨基-五甲基环戊二烯络合物的布和Ta-ME键1 - 6,得到η 2 -iminocarbamoyl化合物[TACP *(N吨丁基)氯{η
Insertion of carbon dioxide and isocyanide into tantalum–amide and tantalum–methyl bonds
作者:Javier Sánchez-Nieves、Pascual Royo
DOI:10.1016/s0022-328x(00)00851-2
日期:2001.3
The methyl-amide complex [TaCp*((NBu)-Bu-')Me(NMe2)] (1a) was isolated by reaction of the chloro-methyl [TaCp*((NBu)-Bu-')MeCl] complex with LiNMe2. Reaction of the mono-amide compounds [TaCp*((NBu)-Bu-':)XY] (X = NMe2, Y = Me (1a), X = NH'Bu, Y=Me (1b), Cl (1c)) with CO2 gives the eta (2)-carbamate derivatives [TaCp*((NBu)-Bu-')(eta (2)-O2CX)Y] (X =NMe2, Y=Me (2a); X=(NHBu)-Bu-', Y = Me (2b), Cl (2c)). A similar reaction with the di-amide complex [TaCp*((NBu)-Bu-')((NHBu)-Bu-')(2)] (1d) gives the di-carbamate derivative [TaCp*((NBu)-Bu-')( eta (2)-O2C((NHBu)-Bu-')) (eta (1)-O2C((NHBu)-Bu-')] (2d). Reaction of the methyl-carbamate (2a) with isocyanide CNAr (Ar = 2,6-Me2C6H3) gives the eta (2)-iminoacyl-eta (1)-carbamate complex [TaCp*((NBu)-Bu-')(eta (2)-C(Me)=NAr) (eta (1-) O2C(NMe2)] (3a). Formation of the related compound [TaCp*((NBu)-Bu-')(eta (2)-C(Me)=NAr) (eta (1)-O2C((NHBu)-Bu-'))] (3b) was only detected by NMR spectroscopy in C6D6 or CDCl3 whereas the reaction of 2b in hexane gives the eta (1)-iminoacyl-eta (2)-carbamate complex [TaCp*((NBu)-Bu-')(eta (1)-C(Me)=NAr) (eta (2)-O2C((NHBu)-Bu-'))] (3b(')). All of the new compounds were characterized by elemental analysis and H-1- and C-13-NMR spectroscopy. (C) 2001 Elsevier Science B.V. All rights reserved.