Electrophilic methylation of the closo-1,10-R2C2B8H8 (1) (R = H or Me) dicarbaboranes at higher temperatures or thermal rearrangement of the 1,6-R2C2B8Me8 (3) compounds at 400-500 °C generated the B-permethylated derivatives closo-1,10-R2C2B8Me8 (2) in quantitative (>95%) yields. The compounds exhibit extreme air stability as a consequence of a rigid, egg shaped hydrocarbon structures incorporating inner 1,10-C2B8 carborane core.

Department of General and Inorganic Chemistry Faculty of Chemical Technology University of Pardubice Studentská 573 532 10 Pardubice Czech Republic

Institute of Inorganic Chemistry Academy of Sciences of the Czech Republic Husinec Řež 1001 Czech Republic

Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo nám 2 166 10 Prague 6 Czech Republic

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For review, see: Grimes R. N., Carboranes, Academic Press, 3rd edn, 2016

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