Convenient Route to Monocarba-closo-dodecaborate Anions

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...

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Published in:Organometallics 2016-06, Vol.35 (11), p.2022-2025
Main Authors: Tanaka, Naoki, Shoji, Yoshiaki, Fukushima, Takanori
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description 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.
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title Convenient Route to Monocarba-closo-dodecaborate Anions
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