trans-(R,R)-2,2'-(Cyclopenta-1,2-diyl)diphenyl Bis[(R)-O-methylmandelate]

The title compound, C₃₅H₃₄O₆, crystallizes with two independent molecules per asymmetric unit. The molecules assume slightly different conformations. The crystallographically unique molecules stack in columns along the b axis. Close C-H...O contacts are observed between molecules related by a twofold screw axis. Such contacts are: C35-H35...O40 (related by 2 - x,  + y, -1 - z), C...O 3.440 (5) Å; H...O 2.553 (5) Å; C-H...O 153.7 (1)° for molecule 1 and: C33'-H33'...O40' (related by 1 - x, - + y, 1 - z); C...O 3.422 (5) Å, H...O 2.491 (5) Å, 163.3 (1)° for molecule 2. The absolute configuration was established by internal comparison to the (R)-(-)-O-methyl mandelic acid moiety.

-1