N′-tetramethylcyclohexanediamine to afford [Li(μ-CH2NMeC6H10NMe2)2Al(iBu)2], the final complex to be crystallographically characterised. All new products have been spectroscopically characterised through 1H, 7 Li, and 13C NMR studies. Reaction mixtures have also been quenched with D2O and analysed by 2D NMR spectroscopy to ascertain the full metallation versus co-complexation picture taking place in solution
比较了两种密切相关的
锂烷基铝酰胺LiAl(
TMP)2 i Bu 2和LiAl(
TMP)i Bu 3(
TMP:
2,2,6,6-四甲基哌啶)对六个含有N或L的多齿路易斯碱的反应性。 O供体原子或混合的N,O供体集合。在己烷溶液中进行的这些反应的十二种潜在的有机
金属产物中的七种已经在晶体学上进行了表征。这三种结构中,[李(μ-ME 2 NCH 2 CHCH 2 CH 2 CHO)(μ-
TMP)的Al(我丁基)2 ],[李(μ-ME 2 NCH 2 CH 2OCH 2)(μ-
TMP)的Al(我丁基)2 ]和[李(μ-ME 2 NCH 2 CH 2 OCHCH 2 NME 2)(μ-
TMP)的Al(我丁基)2 ]表明,该双酰胺LiAl(
TMP)2 i Bu 2在与氧相邻的碳原子上使多官能路易斯碱选择性去质子化(铝酸盐化),所产生的阴离子被碱的残基捕获。相比之下,单酰胺LiAl(
TMP)i Bu 3通