C 18 H 15 OP, M r =278.3, orthorhombic, Pbca, a=29.085 (15), b=9.149 (4), c=11.266 (5) A, V=2997.9 A 3 , Z=8, D x =1.233 g cm -3 , λ(Mo Kα)=0.71069 A, μ=1.170 cm -3 , F(000)=1168, T=295 K, R=0.048 for 1156 observed reflections. The P-O and three P-C bond lengths are 1.487 (3), and 1.795 (5), 1.799 (5) and 1.804 (5) A, respectively. The valence angles at P fall into two categories: the three O-P-C angles, 111.8 (2), 112.0 (2) and 113. 3 (2) o , and the three C-P-C angles, each significantly smaller at 106.4 (2) o
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Thomas et al. (1993) studied this question.