Accession Number : AD0287496

Title :   RESEARCH AND DEVELOPMENT TO SYNTHESIZE AND ISOLATE LESSER OR UNKNOWN BORANES

Corporate Author : NATIONAL ENGINEERING SCIENCE CO PASADENA CALIF

Personal Author(s) : DITTER,J.F. ; LANDESMAN,H.E. ; WILLIAMS,R.E.

Report Date : 10 OCT 1962

Pagination or Media Count : 1

Abstract : Kinetic data for the decomposition of nonaborane-15 at 30 were obtained mass spectrometrically, and the rate constant for the observed first order reaction was determined. Nonaborane-15 decomposes into octaborane, which in turn is thermally unstable and decomposes further, probably into hexaborane-10, H and polyborane solids. A tentative rate constant for the decomposition reaction of octaborane, also first order, has been inferred, based on the assumption that its rate of formation equals the rate of decomposition of nonaborane (B9H15 yields B8H14 + (BH) solid). The decomposition reactions of tetraborane-10 and pentaborane-11 were also studied mass spectrometrically, and both were found to produce hexaborane-10 and pentaborane-9. Attempts made to prepare dipentaboryl, B10H16, by coupling bromopentaborane over an Ullman catalyst have been negative. (Author)

Descriptors :   *BOROHYDRIDES, *BORON COMPOUNDS, *DECOMPOSITION, *REACTION KINETICS, CATALYSTS, CHEMICAL REACTIONS, HYDRIDES, MASS NUMBER, MASS SPECTROSCOPY, PENTABORANES, SOLIDS, SYNTHESIS

Distribution Statement : APPROVED FOR PUBLIC RELEASE