a practical and green method for the synthesis of 5h-dibenzo[b,i]xanthene-tetraones and spiro[dibenzo[b,i]xanthene-13,3'-indoline]-pentaones by the condensation of 2-hydroxynaphthalene-1,4-dione with aldehydes or isatins, respectively, in the presence of a catalytic amount of cellulose sulfuric acid (csa) under solvent-free conditions at 100 °c is described. the significant features of this pro...

Dioxetane intermediates readily decompose to chemiluminescent triplet carbonyls, giving rise what has been paradoxically called photochemistry in the dark. In this issue of Photochemistry and Photobiology, Bechara et al. report on mechanistic advances such a reaction. With use horseradish peroxidase for isobutyraldehyde-derived acetone, light emission from acetone singlet oxygen can be quenched...

In the title compound, C27H19ClFN3O3, the pyrazole ring has a twist conformation and the six-membered ring to which it is fused has a screw-boat conformation. The mean plane of the pyrazole ring is inclined to the 2-methyl-indoline ring by 85.03 (9) and by 28.17 (8)° to the mean plane of the iso-quinoline ring system. In the crystal, mol-ecules are linked by pairs of C-H⋯F hydrogen bonds, formi...

In the title compound, C(23)H(20)N(2)O(3)·CH(3)OH, the hexa-hydro-1H-benzo[f]isoindole and indoline rings are planar, with maximum deviations of 0.092 (1) and -0.095 (1) Å, respectively. The dihedral angle between these two rings is 88.03 (4)°. An O-H⋯N inter-action links the main mol-ecule and the methanol solvent mol-ecule. An intra-molecular C-H⋯O inter-action forms an S(6) ring motif. In th...