subsequently rearranges via a second thermally labile intermediate to ultimately generate two diastereomeric end products that show N−N bond cleavage, loss of H2, loss of an aluminum isobutyl group, and NPN ligand migration from tantalum to aluminum. Both of these complexes have been isolated in crystalline form and analyzed by single-crystal X-ray diffraction. The second thermally sensitive intermediate
加入
二异丁基氢化铝(D
IBAL)的侧端部上,上二氮络合物([N
PN] TA)的2(μ-η 1:η 2 -N 2)(μ-H)2,1(其中,[N
PN] =(PhNSiMe 2 CH 2)2 PPh)。这两个终产物是非对映异构旋转异构体,其中发生了N-N键断裂,且Al(i Bu)H基团连接到一个
氮化物原子上。反应通过向1中添加D
IBAL来进行,以生成热敏感的中间体,该中间体已在溶液中表征为通过TAN 2的Al-H添加的结果部分,即,([N
PN] TAH)(μ-η 1:η 2 -NNAl我卜2)(μ-H)2(TA [N
PN),2。该材料随后通过第二个对热不稳定的中间体进行重排,最终产生两个非对映异构终产物,这些终产物显示N-N键断裂,H 2损失,铝异丁基基团损失以及N
PN配体从
钽迁移到铝。这两种络合物均已分离为结晶形式,并通过单晶X射线衍射进行了分析。第二热敏中间已被表征多核NMR光谱学的基础如([N
PN]