CRYSTAL-STRUCTURE OF (2R,3S)-2-PHENYL-3-PHTHALIMIDOTHIETANE

Crystals of the optically active C17H13NO2S, [alpha](D)+213.4 degrees, have been studied by single-crystal X-ray diffraction methods. The cr ystals are orthorhombic, P2(1)2(1)2(1), a = 12.653(1), b = 14.156(1), C = 16.176(1)Angstrom, Z = 8. The structure was solved by direct metho ds and refined to R = 0.046 for 4242 unique reflections. The four-memb ered thietane ring is puckered with dihedral angles of 21.6 and 18.2 d egrees in molecule A and 18.5 and 15.7 degrees in molecule B. It conta ins C(sp(3))- C(sp(3)) single bond distances of 1.533(3)-1.537(3)Angst rom range. The absolute configuration at C2 and C3 atoms is R and S, r espectively.