photoreactor using solar radiation. the effect of various parameters such as ph, initial concentration of pollutant, catalyst dose, oxidant, and time variation were studied. the determination of the best catalyst was studied amongst the four catalysts (tio2, zno, psa and ssa) .the kinetics of degradation of isooctane was also studied. the results showed that tio2 was the best catalyst with a de...

The conformational studies in solution and the solid state of substituted 6-methyl-4-hydroxy-2-pyrones indicated that substitents on 4-hydroxy group clearly favored s- cis arrangement towards formal double bond. steady NOE measurements kinetic tert -butyl, trimethylsilyl trimethylstannyl derivatives showed a marked preference for this conformation solution. structures determined by X-ray diffra...