2-Indanylboronic acid pinacol ester

Boronic acids react with alcohols, with loss of water, to form boronic esters. With simple alcohols, the products are very susceptible to hydrolysis, but with 1,2- and 1,3-diols, the resulting cyclic boronates (1,3,2- dioxaborolanes and 1,3,2-dioxaborinanes) are stable enough to be isolated.