C2oH24NO5P, Mr=389"40, monoclinic, P2~/a, a = 15.332 (3), b = 10-603 (6), 3 c= 12.442 (6) ,h,, fl = 100.89 (3) °, V = 1986 (1) A, Z = 4, Dx=l.30gcm -3, MoKa, A=0"7107A, /z = 1.84cm -~, F(000)= 824, room temperature, R= 0.059 for 2108 observed reflections [Fo > 3or(Fo)]. Out of l l C---C bonds of the biphenyl ring, four bonds (1-35-1-38 A) are significantly shorter than the others * Present address: (1-40-1.43 A). Two P--O single bonds are 1.564 (4) and 1-560 (4)/~ in length, and the P--O double-bond length is 1-454 (4) A. Experimental. Title compound prepared according to the literature (Takeuchi, Shibata & Hamada, 1984). Colorless crystals obtained from ethanol solution. Crystal of dimensions 0.3 × 0-2 × 0.2 mm, Rigaku AFC-1 rotating-anode four-circle diffractometer, graphite-monochromatized Mo Ka radiation. Cell dimensions determined from 16 20 angles in the range 17 < 20 < 23 °. Intensities collected to sin0/a =
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