Key indicators: single-crystal X-ray study; T = 298 K; mean (C-C) = 0.007 Å; R factor = 0.066; wR factor = 0.170; data-to-parameter ratio = 15.0.The title compound, C 23 H 31 O 2 P, has three fully extended substituents around the P-atom chiral centre, forming an S P configuration. The phenyl rings are inclined at a dihedral angle of 3.2 (3) .
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