Based on literature data obtained in various fields with respect to studies on the role of free radicals in biology and on the kinetics of triplet-doublet interactions, it is suggested that excited photosensitizers react in vivo with free radicals formed in malignant tissues during photodynamic therapy (PDT) and this interaction competes with sensitizer-radical + molecule and the singlet oxygen mediated effects.Experimental results by laser flash photolysis and electron spin resonance revealed that sensitizers applied in PDT react with stable free radicals presumably both by energy transfer and electron transfer.Chemiluminescence measurements established that peroxy-type free radicals attack porphyrin compounds resulting in the irreversible transformation of the latter. The corresponding rate constant was compiled.

Die thermische und katalytische Epoxidierung von Isobutylen mit Äthylbenzolhydroperoxid wurde untersucht.

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Untersucht wird die Epoxidierung von Propylen durch Äthylbenzylhydroperoxid in Gegenwart von Molybdän‐naphthenat‐Katalysatoren unter Atmosphärendruck und bei 50 at. Die kinetischen Parameter und die Aktivierungsenergie ergeben, daß in beiden Fällen die Reaktion nach dem gleichen Mechanismus verläuft.

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