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The title biaryl was prepared by Pd-catalyzed intramolecular aryl coupling. It crystallizes monoclinically in the space group  P 2 1  with  a  = 1064.9(2),  b  = 1850.6(5),  c  = 742.5(1) pm and  β  = 106.06(2)°. The asymmetric unit contains two molecules together with one phenol.

Crystal structure of 6 H -benzo[1,2-d]pyran-6-one · 0.5 phenol – a useful, “axially prostereogenic” lactone-bridged biaryl