Acta Cryst. (2008). E64, o758  [ doi:10.1107/S1600536808007599 ]

(1R,1'R,3S,3'S)-5,5',10,10'-Tetramethoxy-1,1',3,3'-tetramethyl-3,3',4,4'-tetrahydro-1H,1'H-8,8'-bi[benzo[g]isochromene]

J. J. P. Sejberg, J. Sperry, K. W. Choi, P. D. W. Boyd and M. A. Brimble

Abstract: In the title compound, C₃₄H₃₈O₆, the methyl groups on each pyran ring exhibit 1,3-cis stereochemistry, established during synthesis by pseudo-axial delivery of hydride during a lactol reduction step. In the crystal structure, the molecule lies on a twofold rotation axis and the torsion angle about the central diaryl bond is 41.3 (1)°. The molecules pack in a herringbone arrangement.

Online 29 March 2008

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