Transition metal catalysed dehydrogenation of amine-borane fuel blends
作者:Sib Sankar Mal、Frances H. Stephens、R. Tom Baker
DOI:10.1039/c0cc03585h
日期:——
Mixtures containing ammonia-borane and sec-butylamine-borane remain liquid throughout the hydrogen release process that affords tri(N-sec-butyl)borazine and polyborazylene. Concentrated solutions with metal catalysts afford >5 wt% H2 in 1 h at 80 °C and addition of (EMIM)EtSO4 ionic liquid co-solvent eliminates competing formation of insoluble linear poly(aminoborane) (EMIM = 1-ethyl-3-methyl-imidazolium).
N″-triethylborazine was carried out at 50 °C in the presence of a rhodium(I) catalyst. Addition of dppb or DPEphos (1 equiv.) to RhH(CO)(PPh3)3 gave the best catalyst for hydroboration of ethylene at 50 °C, resulting in a quantitative yield of B,B′,B″-triethyl-N,N′,N″-trimethylborazine. On the other hand, a complex prepared from (t-Bu)3P (4 equiv.) and [Rh(coe)2Cl]2 gave the best yield for hydroboration of terminal
Borazoles. Part III. Some reactions of tri-N-alkylborazoles with Grignard reagents
作者:A. Grace、P. Powell
DOI:10.1039/j19660000673
日期:——
The reactions of Grignard reagents with tri-B-chlorotri-N-isopropylborazole and with four tri-N-alkylborazoles having branched alkyl groups have been studied, and methods for the preparation of some mono-, di-, and tri-B-substituted derivatives are described. Stepwise substitution of tri-N-isopropyl- and tri-N-s-butyl-borazoles occurs. The reactions were followed by gas–liquid chromatography. The infrared