These compounds are stable in solution up to temperatures of 90 °C. In contrast to the NHC alane adduct (iPr2Im)·AlH3 (I) and (Dipp2Im)·AlH3 (II), no ring expansion reaction to six‐membered heterocyclic rings or ring opening reaction were observed for the reaction of (iPr2Im)·AlH2(NR2) with another equivalent of the NHCs iPr2Im or Dipp2Im. Thus, amide substituted NHC alane adducts show a much high stability
NHC
烷烃加合物NHC·AlH 3的反应(NHC = N-杂环碳烯; NHC = i Pr 2 Im,Dipp 2 Im; R 2 Im = 1,3-二二有机基-
咪唑啉-2-亚烷基; i Pr =异丙基; Dipp = 2,6-二异丙基苯基)与仲胺HN R 2 [ R = i Pr,Ph,Si(CH 3)3 ],然后使
三甲胺铝烷加合物(NMe 3)·AlH 3与仲胺反应与NHC的反应都导致形成化合物NHC·AlH 2(N R2)1 – 6 [NHC = i Pr 2 Im,Dipp 2 Im,R = i Pr,Ph,Si(CH 3)3 ]。这些化合物在高达90°C的温度下在溶液中稳定。与NHC
烷烃加合物(i Pr 2 Im)·AlH 3(I)和(Dipp 2 Im)·AlH 3(II)相比,未观察到六元杂环的扩环反应或开环反应。 (i Pr 2 Im)·AlH 2(NR 2)与另一个等价的NHC