Crystal and Molecular Structure of (S)-a-(pCyanobenzenesulphonamido)-B- propiothiolactone, C10H8N203S2

Crystals of the title compound are monoclinic, space group P21, with a = 1.0018(2), b = 0.9722(2), c = 0.6262(1) nm, fJ = 102.32(1)° and Z = 2. The structure was solved by direct methods using 1113 reflections with I 2\u27: 20 (I) and refined to a conventional R index of 0.051. The heterocyclic four-membered ring is bent and has a puckering angle of 18.7(7)°. The dihedral angle between the best planes of the B-propiothiolactone and benzene ring is 70.2(3)°. Discrete molecules are connected along the b axis by intermolecular hydrogen bonds N--H ... O of 309.5(9) pm

Crystal and Molecular Structure of (S)-a-(p-Bromobenzenesulphonamido)-B-propiothiolactone

(S)-a-(p-Bromobenzenesulphonamido)-{J-propiothiolactone, C9H8N03S2Br, crystallizes in the orthorhombic system with a = = 1.0125(2), b = 1.2439(1) and c = 0.9304(3) nm, Z = 4 in space group P212121• The compound is isostructural with the analogous chloro derivative. The crystal structure has been refined from diffractometer data to conventional R and Ra values of 0.045 and 0.048 for 2277 reflections with I ~ 2a (I). The heterocyclic four-membered ring has a puckering angle of 8.9(4) 0 • The dihedral angle between the best planes of the /)-propiothiolactone and benzene rings is 84.1(2) 0 • The structure consists of discrete molecules connected along the a axis by intermolecular hydrogen bonds N-H ... O of 291.9(7) pm

Selective functionalization of calix[4]arenes at the upper rim

Methods are described for the selective diametrical functionalization of calix[4]arenes at the upper rim by transfer of functionality and selective substitutions at the para positions of the phenol rings. The crystal structure of 26,28-dimethoxy-11,23-dinitrocalix[4]arene is described