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Lithium salts of [1,12-dialkyl-CB11Me10]- anions
Michal Valášek1, Jan Štursa, Radek Pohl
1Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 166 10 Prague 6, Czech Republic.
Abstract:
We report the syntheses of several [1-R-CB(11)-Me(11)](-) and [1-R-12-R'-CB(11)-Me(10)](-) anions (R, R' = alkyl) and the solubilities of their lithium salts in cyclohexane. These solutions are of interest as Lewis acid catalysts. The new anions are not directly accessible by methylation with methyl triflate because of intervening triflyloxy substitution on one or more boron vertices. The difficulty has been circumvented in two ways. Either (i) an iodo substituent is first introduced into position 12, permitting a clean decamethylation, and then replaced with a methyl by reaction with trimethylaluminum or (ii) the offending triflyloxy substituents are replaced with methyls by reaction with trimethylaluminum.
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