Synthesis and characterisation of trialkylaluminium–dialkylamine adducts: X-ray diffraction and 1H NMR studies †
作者:Donald C. Bradley、Gregory Coumbarides、Ian S. Harding、Geoffrey E. Hawkes、Izaque A. Maia、Majid Motevalli
DOI:10.1039/a902973g
日期:——
Trialkylaluminium–dialkylamine adducts of general formula R13Al·NHR22 (R1 = Me, Et, Pri, Bui or But; R2 = Me, Et, Pri or Bui) were synthesized by reacting R13Al and NHR22. at high temperatures these adducts either eliminate alkane, forming dimeric amides, or dissociate. Increase in the bulk of R1 favours alkane elimination. In the 1H NMR spectra of the complexes R13Al·NHEt2 the methylene protons of
通式R 1 3 Al·NHR 2 2(R 1 = Me,Et,Pr i,Bu i或Bu t ; R 2 = Me,Et,Pr i或Bu i)的三烷基铝-二烷基胺加合物1 3 Al和NHR 2 2。在高温下,这些加合物可消除烷烃,形成二聚酰胺,或离解。R 1的大部分增加有利于烷烃的消除。在配合物的1 H NMR光谱中R 1 3 Al·NHEt 2乙基的亚甲基质子表现出非等价性,并且亚甲基质子信号的高温聚结是由于交换过程涉及到单分子或双分子步骤中Al-N导数键的断裂和重整。该过程的活化自由能已经与基团R 1的主体相关。的我的晶体结构3的Al·NHMe 2和卜吨3的Al·NHEt 2进行了讨论,确定和它们的分子结构。