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A novel synthesis of arylboronic esters by a reductive electrochemical coupling reaction between aromatic halides and pinacolborane (HBpin, pin pinacolate) has been carried out leading to arylboronic esters in moderate to good yields.

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Organo-boron compoundsOrgano-boron compounds S 0040 New Electrosynthesis of Arylboronic Esters from Aromatic Halides and Pinacolborane. -The mild reductive electrochemical coupling reaction between aromatic halides and pinacolborane is described. The reaction can be applied to non-activated aryl chlorides as well as to hindered aryl halides. The yields of pinacol esters obtained by electrolysis are slightly better than those reported by a chemical Pd-catalyzed procedure. -(LAZA, C.; DUNACH, E.; Adv. Synth. Catal. 345 (2003) 5, 580-583; Lab. Chim. Bio-Org., Fac. Sci., Univ. Nice-Sophia-Antipolis, F-06108 Nice, Fr.; Eng.) -Bartels 34-158