Initiation of Polypropylene Photooxidation. 1. Polynuclear Aromatic Compounds

PHOTOOXIDATION OF a REFINED PETROLEUM OIL: INHIBITION BY Β‐CAROTENE AND ROLE OF SINGLET OXYGEN

“…The mechanism is similar to others (e.g. Aspler et al, 1976) suggested for the photooxidation of hydrocarbon polymers containing traces of polycyclic aromatics or other photosensitizers.…”

The effect of heavy-atom solvents on the photooxidation of anthracene

“…' There are two possible paths in the reaction of singlet oxygen with anthracene to form anthraquinone. One path involves anthracene peroxide (20,23), although it could not be isolated from the reaction mixtures in this work.…”

“…The important effect of solvent has been demonstrated by Aspler et al Thus, in isooctane, photolysis of a dilute solution of anthracene gives a high yield of the photodimer, whereas in Freon 113, roughly equimolar yields of endoperoxide, anthraquinone, and anthracene dimer are formed (20).…”

“…The heavy-atom effect in the photooxidation of anthracene and its derivatives The photolysis products from air-saturated anthracene solutions are known to be strongly dependent on the anthracene concentration and the type of solvent used (8,19,20). The important effect of solvent has been demonstrated by Aspler et al Thus, in isooctane, photolysis of a dilute solution of anthracene gives a high yield of the photodimer, whereas in Freon 113, roughly equimolar yields of endoperoxide, anthraquinone, and anthracene dimer are formed (20).…”

“…It has been proposed (20,23) that anthracene photooxidation proceeds via oxygen quenching of the triplet excited state of anthracene molecules and reaction of the resulting singlet oxygen with an anthracene molecule in its ground state. An alternative possibility has been suggested involving electron transfer from triplet anthracene to an oxygen molecule (24).…”