Electrosynthesis of boronic acids and esters

Electrosynthesis offers an interesting alternative to the classical synthesis of organoboronic derivatives. Aryl-, allyl- and benzylboronic acids can be prepared via the reduction of organic halides in the presence of trialkylborates or pinacolborane. Electrochemical methodology avoids the use of noble metals and of low temperatures. It also allows the use of more accessible organic chlorides as starting substrates. With dihalogenated derivatives, good borylation selectivities can be obtained. 63