Carboranes from Alkylboron Hydrides.
Abstract
Both one-carbon and two-carbon carboranes have been prepared from the flow pyrolysis of several alkylboronhydrides. Carbahexaborane(7) and 2-carbahexaborane(9) have been prepared from methylpentaborane(9) and the corresponding C-methyl derivatives of these carboranes are obtained from ethylpentaborane(9). Pyrolysis of 1,2-dimethylpentaborane gives a modestly high yield of 1,5-C2B3H5 and, suprisingly, no detectable quantity of B-methyl derivatives of CB5H7. The four-carbon carborane C4B2H6 is obtained in low yield from 1,2-tetramethylenediborane(6). Temperature dependent nuclear magnetic resonance studies on CB5H7 and its C-methyl derivative reveal a bridge hydrogen tautomerism with a Free energy of ca. 14 and 12 kcal, respectively. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1971
- Accession Number
- AD0723243
Entities
People
- Charles Ungermann
- Elliott Groszek
- George T. F. Wong
- John B. Leach
- Thomas Onak
Organizations
- California State University, Los Angeles