Abstract
2,3-Dichloro-5,6-dimethylbenzoquinone reacted with di(sodiothio)maleonitrileto produce heterocyclic thianone, 6,7-dimethy1-5,8-dioxo-5,8-dihydro-1,4-benzodithin-2,3-dicarbonitrile which was cyclo-tetramerizedin the presence of lithium/pentanol and acetic acid producing tetra 6,7-dimethy1-5,8-dioxo-5,8-dihydro-1,4-benzodithin-porphyrazine (2H-Pz). Likewise, the dicarbonitrile compound was cyclo-tetramerized in the presence of metal salt and quinoline affording tetra 6,7-dimethy1-5,8-dioxo-5,8-dihydro-1,4-benzodithin-porphyrazinato-metal II (M-Pz), M is Co, Ni or Zn. Photoactivity of the synthesized porphyrazines was reached out to the visible light range. The prepared porphyrazines showed efficient sensitized catalysts by using of solar energy for the completely photocatalytic oxidation of thiophenol and benzyl thiol to their disulfides (with an average yield of 93% and 90%, respectively) in the presence of air atmosphere within 20 minutes.