Pinacol → 2-[5-Chloro-2-(phenylmethoxy)phenyl]-4,4,5,5-tetramethyl-1,3,2-dioxaborolane

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Pinacol (3.24 g) was added to a solution of [5-chloro-2-(phenylmethoxy)phenyl]-boronic acid (6 g) in diethyl ether, and stirred for 24 h. 4 A molecular sieves and pinacol (1.5 g) were added, stirred for a further 24 h. The sieves were filtered and the filtrate was washed with water and brine, then dried (MgSO4) and concentrated in vacuo. Yield 6.8 g.

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