University of Nevada

Andreas Franken

Josef Michl

Benjamin T King

This invention relates to an improved method for making unsubstituted carborane anions and monosubstituted carborane anions of formula: (R&#x2014;CB&#x2014;H)where n is an integer ranging from 5 to about 11 and m' is an integer ranging from 5 to 16 where the relative values of n and m&#x2032; depend upon the exact structure of the carborane and the presence of a non-hydrogen substituent. m as used herein is an integer ranging from 5 to 16. When R is hydrogen the anion is unsubstituted. When R is a halogen, a phenyl, a substituted phenyl group, such as fluorophenyl group, or any other substituent, the carborane is substituted. The method is particularly useful for preparation of twelve-vertex carborane anions R&#x2014;CBH, where R is a defined above, and is specifically useful for preparation of the unsubstituted carborane CBH-??, where R is H.

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Boulder, CO, United States of America

Andreas Franken