(μ₂-Pinacolato-O,O')-bis(pinacolato-O,O')diboron

The title compound, 2,2′-(2,3-dimethyl-2,3-butanediyldioxy)bis­(4,4,5,5- tetramethyl-1,3,2-dioxaborolane, C₁₈H₃₆B₂O₆, B₂pin₃, has two trigonal planar B atoms, each chelated by one pinacolate group, linked by a third pinacolate. The molecule is centrosymmetric, with an exactly anti conformation for the bridging pinacolate, and the two Bpin five-membered rings have a twist conformation with torsion angle O-C-C-O = −27.39 (13)°. The B—O bonds to the bridging pinacolate [1.353 (2) Å] are slightly shorter than the chelate B—O bonds [1.367 (2) and 1.373 (2) Å].

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