SYNTHESIS OF CARBORANES FROM DIHYDROCARBORANES
Abstract
Carborane-2,5 is the major volatile carborane formed from the pyrolysis of dihydrocarboranes 2,4. The presence of trimethylamine during the pyrolysis significantly increases the yield of sym-carborane-2,4. The carboranes sym-C2B3H5, unsym-C2B4H6, sym-C2B4H6 and C2B5H7 were prepared in a silent electric discharge in very low yields. It was decided that catalytic removal of H2 or removal of BH3 by a Lewis base might lead to the preparation of C-alkylderivatives of C2B4H6 and C2B3H5, respectively. Since loss of H2 and BH3 are considered to occur in the related boron hydrides merely by heating, a preliminary experi ment was undertaken to determine which reaction was preferred. No alkyl derivatives of C2B3H5 were detected from the dihydrocarboranes. Alkyl derivatives of symmetrical-C2B4H6 were isolated; however, no alkyl derivatives of unsymmetrical C2B4H6 were observed. C-alkyl derivatives of C2B5H7 were produced in unanticipated abundance.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1963
- Accession Number
- AD0409130
Entities
People
- F.j. Gerhart
- Robert E. Williams
- Thomas Onak