Borane-catalyzed hydroboration of substituted alkenes by lithium borohydride or sodium borohydride |
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Authors: | Claude Villiers Michel Ephritikhine |
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Institution: | Service de Chimie Moléculaire, DSM, DRECAM, CNRS URA 331, Bat. 125, CEA Saclay, 91191 Gif-sur-Yvette, France |
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Abstract: | In the presence of a catalytic amount of BH3·Me2S, TiCl4 or Me3SiCl, LiBH4 or NaBH4 are capable of hydroborating alkenes by following the unusual order of decreasing reactivity: tetramethylethylene > 1-methylcyclohexene > cyclohexene; the key step of the catalytic cycle is the exchange reaction between LiBH4 and the mono- or dialkylboranes resulting from hydroboration of the more substituted alkenes with BH3. |
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Keywords: | hydroboration alkenes borohydride catalysis |
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