Accession Number : AD0697150

Title :   THE VAPOR PHASE REACTION OF DIBORANE WITH ACETONE,

Corporate Author : BALLISTIC RESEARCH LABS ABERDEEN PROVING GROUND MD

Personal Author(s) : Kuhn,Lester P. ; Doall,J. Omar

Report Date : SEP 1969

Pagination or Media Count : 30

Abstract : The kinetics of the gas phase reaction, B2H6 + a(CH3)2 C=O yielding 2HB(i-prO)2, was studied. The reaction was found to be homogeneous, first order in diborane, and first order in acetone. The second order rate constant is given. The reaction is catalyzed by ethyl ether and tetrahydrofuran. The catalyzed reaction is first order in ligand, first order in diborane, and zero order in acetone. Its second order rate constant is also given. The data suggest that diborane and the ligand react reversibly to form a 1:1 complex in which both bridged B-H bonds remain intact. The complex then rearranges slowly in a rate determining step to form a second complex in which one of the bridged B-H bonds is broken. The second complex reacts with acetone in a series of rapid steps to form diisopropoxyborane. Consistent with this hypothesis is the observation that cyclobutanone is reduced by diborane in the uncatalyzed reaction at a slower rate than acetone and in the catalyzed reaction at the same rate as acetone. (Author)

Descriptors :   (*DIBORANES, CHEMICAL REACTIONS), (*ACETONES, CHEMICAL REACTIONS), REACTION KINETICS, BORANES

Subject Categories : Inorganic Chemistry
      Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE