一系列的碳二亚胺插入产物使用各种铝试剂来制备(即,为AlR。3(R =甲基,乙基),ALX 2 Y(X =氯,R; Y =氯,NR” 2))和1,3-各种化学计量比的二异丙基和1,3-二叔丁基碳二亚胺。所得到的产物1 - 20分离或者作为无色液体或作为固体。这些化合物通过1 H NMR,13 C NMR,IR和质谱数据表征。获得了一些代表性化合物的元素分析数据。两种化合物(化合物8 ''和10的晶体结构通过单晶X射线衍射测定。还报道了连接至铝原子的烷基,氯或氨基的竞争性迁移至碳二亚胺的碳上。
作者:Sarah L. Aeilts、Martyn P. Coles、Dale C. Swenson、Richard F. Jordan、Victor G. Young
DOI:10.1021/om980223m
日期:1998.7.1
The synthesis and structures of new aluminum complexes incorporating guanidinate ligands (R2NC(NR')(2)(-)) are described. The reaction of (PrN)-Pr-i=-C=(NPr)-Pr-i with LiNR2 reagents yields Li[R2NC((NPr)-Pr-i)(2)] guanidinate salts, which are reacted in situ with AlCl3 or AlMe2Cl to afford (R2NC((NPr)-Pr-i)(2))AlCl2 (1a, R = Me; 1b, R = Et; 1c, R - Pr-i; 1d, R = SiMe3) or (R2NC((NPr)-Pr-i)(2))AlMe2 (2a, R = Me; 2b, R = Et; 2c, R = Pr-i), respectively. The reaction of 1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidine (hppH) with AlMe3 generates (mu-hpp)AlMe2)(2) (3). Complexes 1a, 1d, and 3 have been characterized by X-ray crystallography. la and Id adopt monomeric structures with symmetric chelated bidentate guanidinate ligands. Delocalization of the -NR2 lone pair into the chelate ring is important for 1a but not for 1d, due to N-Si pi-bonding and steric crowding. The bicyclic structure of the hpp(-) ligand enforces a dimeric mu-hpp(-) structure for 3.