Abstract
Friedel-Crafts acylation of the benzene nucleus of 1-phenyl-1,2-, 1,7- and 1,12-dicarba- closo-dodecaboranes (phenylcarboranes) proceeded in the presence of trifluoromethanesulfonic acid. In spite of the strong electron-withdrawing effect of the carborane skeleton, para-acylated products predominated. However, substitution of a methyl group at the 2-position of 1-phenyl-1,2-carborane resulted in a change of isomer distribution.
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