Bis(tetramethylpiperidino)aluminum Halide Adducts tmp2AlX · Do and Tetrahaloaluminates of Tricoordinated Aluminum Cations [tmp2Al(Do)]AlX4
作者:Ingo Krossing、Heinrich Nöth、Holger Schwenk-Kircher
DOI:10.1002/(sici)1099-0682(199807)1998:7<927::aid-ejic927>3.0.co;2-i
日期:1998.7
Upon treatment with Lewis bases Do (Do = pyridine bases or THF), the Lewis acids tmp2AlX (X = Cl, Br, I) are converted exclusively to the monoadducts tmp2AlX.Do. Crystal and mol. structure of these monoadducts were detd. The Al-X bonds of these addn. compds. are considerably elongated, indicating a tendency towards the formation of ionic species [tmp2Al(Do)]X. Due to the steric requirements of the
在用路易斯碱 Do(Do = 吡啶碱或 THF)处理后,路易斯酸 tmp2AlX(X = Cl、Br、I)专门转化为单加合物 tmp2AlX.Do。水晶和摩尔。检测了这些单加合物的结构。这些添加的 Al-X 键。化合物。显着拉长,表明有形成离子物质 [tmp2Al(Do)]X 的趋势。由于庞大的 tmp 配体的空间要求,添加。过量的路易斯碱不会强制这些化合物。形成四配位铝阳离子 [tmp2Al(Do)2]+ 或五配位加合物 tmp2AlX.Do2。尝试准备。通过 tmp2AlX.Do 与亲核性相对较低的 qateq 配合物 [MY = NaBP4, AgBPh4, LiB(C6F5)4, AgBF4, AgOtos] 反应生成苯化产物(例如 tmp2AlPh 和 BPh3.py)或四配位化合物。化合物。tmp2AlY。做(Y = 阴离子)。不过,补充。1 当量 如 27Al-NMR 数据和条件所示,AlX3