Chiral phosphine ligands derived from sugars. 14. Crystal structure of diphenyl(methyl 4 ',6 '-O-benzylidene-3 '-deoxy-alpha-D-altropyranoside-3-) phosphine oxide

The crystal structure of the title compound, C26H27O6P, has been determined by single-crystal X-ray diffraction analysis. The crystal is orthorhombic with space group P2(1)2(1)2(1), a = 6. 154 (4), b = 17. 199 (8), c = 22. 18 0 (3) Angstrom, V = 2347. 6 Angstrom(3), D-c = 1. 32 g/cm(3), F(000) = 984, mu = 1. 5 cm(-1), Z = 4, and final R = 0. 075 and R-w = 0. 080 for 1417 re flections (I greater than or equal to 3 sigma(I)). The X-ray diffraction an alysis revealed that the structure of the title compound s similar to that of its parent phosphine and the pyranose and 4, 6-O-benzylidene rings remai n distorted chair conformations.