Department of Chemistry, University of California, Riverside, California 92521-0403, USA.
J Am Chem Soc. 2010 Mar 31;132(12):4062-3. doi: 10.1021/ja100297b.
The carborane acid H(CHB(11)Cl(11)) reacts with chloroalkanes RCl to give isolable dialkylchloronium ion salts, [R(2)Cl][CHB(11)Cl(11)], that are stable at room temperature. X-ray crystal structures have been obtained for R = CH(3) and CH(2)CH(3), revealing bent cation structures with C-Cl-C angles of 101.5 and 105.8 degrees , respectively. The dimethylchloronium ion salt loses CH(3)Cl upon heating and forms sublimable CH(3)(CHB(11)Cl(11)), providing a clean synthetic route to an extremely potent electrophilic methylating agent. IR spectra of all species have been interpreted, including the C-Cl stretch in CH(3)-ClCHB(11)Cl(10).
硼烷酸 H(CHB(11)Cl(11)) 与氯代烷烃 RCl 反应，生成可分离的二烷基氯化鏻离子盐[R(2)Cl][CHB(11)Cl(11)]，在室温下稳定。获得了 R = CH(3)和 CH(2)CH(3)的 X 射线晶体结构，分别揭示了弯曲的阳离子结构，C-Cl-C 角分别为 101.5 和 105.8 度。二甲基氯化鏻离子盐在加热时失去 CH(3)Cl 并形成可升华的 CH(3)(CHB(11)Cl(11))，为极其有效的亲电甲基化试剂提供了干净的合成途径。所有物种的红外光谱都进行了解释，包括 CH(3)-ClCHB(11)Cl(10)中的 C-Cl 伸缩。
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