The reaction of Li[1-tBuMe2Si-1,2-C2B10H10] with N-(bromoethyl)phthalimide or N-3-(bromopropyl)phthalimide generates unusual carboranyl heterocycles, resulting from nucleophilic substitution followed by insertion of a phthalimide carbonyl into the C–Si bond. The structure of one was determined by single crystal X-ray diffraction. Reaction of the heterocycles with nBu4NF affords closo-1-C6H4(CO)2N(CH2)n}-1,2-C2B10H11 (1bn = 2 and 1cn = 3) together with the anions nido-[7-C6H4(CO)2N(CH2)n}-7,8-C2B9H11]− as minor side-products on prolonged reaction. The prolonged reaction of 1b and 1c with hydrazine results in deboronation to give hydrazine solvates of zwitterionic nido-[7-H3N(CH2)n}-7,8-C2B9H11]. A single crystal X-ray diffraction study for one reveals an elegant dimeric architecture supported by hydrazine-bridged hydrogen bonds. The reaction of the heterocycles with ethanolic KOH results in cluster deboronation and partial deprotection of the amine group to give nido-[7-(2-O2CC6H4CONH)(CH2)n-7,8-C2B9H11]2− as potassium salts which can be metathesised to less hygroscopic Me3NH+ salts. The molecular structure of one of the latter displays hydrogen bonding generating a dimeric unit. Complete deprotection of the amine function in these salts by water–HCl gives zwitterionic aminoalkylcarboranes nido-7-H3N(CH2)n}-7,8-C2B9H11.
Li[1-tBuMe2Si-1,2-C2B10H10]与N-(
溴乙基)邻苯二甲
酰亚胺或N-3-(
溴丙基)邻苯二甲
酰亚胺反应生成不寻常的碳
硼烷基杂环,这是由亲核取代然后将邻苯二甲
酰亚胺羰基插入C中产生的–
硅键。通过单晶X射线衍射确定了其中一种的结构。杂环与 nBu4NF 反应得到 closo-1-
C6H4(CO)2N(
CH2)n}-1,2-C2B10H11 (1bn = 2 和 1cn = 3) 以及阴离子 nido-[7- (CO) )2N( )n}-7,8-C2
B9H11]− 作为长时间反应中的少量副产物。 1b和1c与
肼的长时间反应导致脱
硼,得到两性离子nido-[7-
H3N( )n}-7,8-C2
B9H11]的
肼溶剂化物。一项单晶 X 射线衍射研究揭示了一种由
肼桥氢键支持的优雅二聚体结构。杂环与
乙醇 KOH 的反应导致簇脱
硼和胺基的部分脱保护,得到 Nido-[7-(2-O2C CONH)( )n-7,8-C2
B9H11]2−
钾盐,其可以复分解为吸湿性较低的 Me3NH+ 盐。后者之一的分子结构显示出氢键,产生二聚单元。通过
水-HCl 将这些盐中的胺官能团完全脱保护,得到两性离子
氨基烷基碳
硼烷 nido-7- ( )n}-7,8-C2
B9H11。