Hydroboration. 97. Synthesis of New Exceptional Chloroborane-Lewis Base Adducts for Hydroboration. Dioxane-Monochloroborane as a Superior Reagent for the Selective Hydroboration of Terminal Alkenes
Josyula V. B. Kanth and Herbert C. Brown*
*H. C. Brown Center for Borane Research, Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, Email: hcbrownpurdue.edu
J. V. B. Kanth, H. C. Brown, J. Org. Chem, 2001, 66, 5359-5365.
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Convenient methods for the preparation of stable and non-volatile mono- and dichloroborane adducts of dioxane from dioxane-BCl3 and NaBH4 in the presence of catalytic amounts of tri- or tetraglyme were developed. The dioxane-monochloroborane adduct hydroborates representative olefins cleanly and rapidly and lead to the corresponding alcohols in quantitative yields after oxidation.
preparation of borane reagents