G. Biswas

Photo-Fries rearrangements in N-sulphonyl carbazoles

Abstract When photo-Fries rearrangements in N-sulphonyl carbazoles 1 in benzene or methanol smoothly afforded 1- and 3-sulphonylcarbazoles 2 and 3 respectively in 29–55% yield, N-benzoylcarbazole 1d did not undergo similar rearrangements to give the expected products.

Regioselective Ring Opening of Oxiranes Catalysed by Montmorillonite Clay: A Simple Synthesis of β-Hydroxy Sulfones

Abstract Oxiranes and sodium p-toluene sulfinate salt react smoothly in a regioselective manner in the presence of montmorillonite clay to furnish the corresponding β-hydroxy sulfones in good to excellent yield.

1,3‐Bis[4,6‐bis(methylthio)‐1H‐pyrazolo[3,4‐d]pyrimidin‐1‐yl]propane

In the crystal structure of 1,3-bis[4,6-bis(methylthio)-1H-pyrazolo[3,4-d]pyrimidin-1-yl]propane, C l7 H 20 N 8 S 4 , the molecules exhibit a skewed mode of stacking of the two pyrazolo[3,4-d]pyrimidine rings due to an intramolecular π-π interaction between the heterocyclic rings.

Crystal structure of N-(4-nitrophenyl)-N-phenylsulfonamide

The crystal structure of N-(4-nitrophenyl)-N-phenylsulfonamide (C18H14N2O4S), a derivative of sulfonamide, has been determined by X-ray diffraction method using CuKα radiation. The compound crystallizes in the monoclinic space groupP21/n, witha=24.463(1),b=5.745(2),c=11.428(3)Å andβ=94.39(2)°. The structure was solved by direct methods and refined by full-matrix least squares to a finalR value of 0.045 with 3032 unique reflections. The dihedral angle between the substituents phenyl ring B and the phenyl A is 94.7(3)°. The S atom is in the usual distorted tetrahedral configuration.

A [3.1.0]-fused 2',3'-modified β-D-pyrazolo[3,4-d]pyrimidine nucleoside

The furanose ring in 4,6-bis(methylthio)-2-(2,3-anhydro-1-deoxy-β-D-allofuranosyl)-2H-pyrazolo[3,4-d]pyrimidine, C 13 H 16 N 4 O 4 S 2 , is almost planar with the epoxide ring in an exo orientation.

Bis(2,4-diaminopyrimidinium) Sulfate Monohydrate, 2C4H7N4+.SO42−.H2O

The asymmetric unit of the crystal consists of one sulfate ion, one water molecule and two 2,4-diaminopyrimidine (DAP) molecules stacked parallel to the b direction with average perpendicular separations of 3.310(4) and 3.343(4)A, respectively. The tilt angle between the least-squares planes of the two DAP molecules in the asymmetric unit is 2.1 (1)°. The structure is stabilized by stacking forces, N-H...N hydrogen bonds and N-H...O hydrogen bonds.

Crystal and molecular structure of di(2-methylbenzotriazole) sulfate, (C7N3H9)2SO4

AbstractThe structure of di(2-Methylbenzotriazole) sulphate, (C7N3H9)2SO4, has been solved by X-ray diffraction methods. The compound crystallises in triclinic space group P

Tropinyl 2-isopropylbenzo[b]thiophene-3-carboxylate, C20H25NO2S

\bar 1