 For example, phenylboronic acid is produced from phenylmagnesium bromide and trimethyl borate followed by hydrolysis

Another method is reaction of an arylsilane (RSiR3) with boron tribromide (BBr3) in a transmetallation to RBBr2 followed by acidic hydrolysis.A third method is by palladium catalysed reaction of aryl halides and triflates with diboronyl esters in a coupling reaction.An alternative to esters in this method is the use of diboronic acid or tetrahydroxydiboron ([B(OH2)]2).