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Synthesis of permethyldodecaborate and paramagnetic dodecaborate salt

United States Patent

March 12, 2002
View the Complete Patent at the US Patent & Trademark Office
The dodecamethyl closo-borane dianion [closo-B.sub.12 (CH.sub.3).sub.12 ].sup.2- and anion [closo-B.sub.12 (CH.sub.3).sub.12 ].sup.- were synthesized and characterized. Dodecamethyl-closo dodecaborate (2-) was produced from [closo-B.sub.12 H.sub.12 ].sup.2-, using trimethylaluminum, and methyl iodide and modified Friedel-Crafts reaction conditions. The anion was produced from the dianion by chemical oxidation using ceric (4) ammonium nitrate in acetonitrile. The anion and dianion were both characterized by .sup.1 H and .sup.11 B NMR spectroscopy, high-resolution fast atom bombardment (FAB) mass spectrometry, cyclic voltammetry, and single-crystal X-ray diffraction. The "camouflaged" polyhedral borane anion [closo-B.sub.12 (CH.sub.3).sub.12 ].sup.2-, can be used as a precursor to materials that offer a broad spectrum of novel applications ranging from drug applications and supramolecular chemistry to use as a weakly-coordinating dianion.
Hawthorne; M. Frederick (Encino, CA), Peymann; Toralf (Los Angeles, CA)
The Regents of the University of California (Oakland, CA)
09/ 576,842
May 23, 2000
The present invention relates to unique three-dimensional methylated icosahedral boron cage compounds This invention was made with support under Contract Number DE-FG02-9ER61975 awarded by the U.S. Department of Energy. The Government has certain rights in the invention.