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Convenient Route to Monocarba-closo-dodecaborate Anions

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posted on 2016-06-02, 13:24 authored by Naoki Tanaka, Yoshiaki Shoji, Takanori Fukushima
Monocarba-closo-dodecaborate anion [HCB11H11] (1) and its derivatives are superb anionic species with remarkably high chemical stability and low nucleophilicity. Here we report a convenient two-step synthesis of 1, starting from nido-decaborane­(14) (2) through the formation of arachno-[CB9H14] (3). In this protocol, the use of Me3NH+ as a countercation of 1 and 3 enables facile cation exchange, thus greatly enhancing access to the carbaborate anions. We also demonstrate an efficient perchlorination reaction of 1 into [HCB11Cl11] (4). The detailed synthetic protocols as well as the full analytical data presented herein should provide a general and reliable recipe for the synthesis of these anionic species.