The transient photochem. of Diflunisal has been investigated in aq. soln. The photoreactivity of the compd. is quite unusual for fluorinated derivs. The loss of fluoride does not occur from an excited state, as expected, but is photostimulated through a reaction involving trapping by the ground state of electrons photoejected from Diflunisal. Mono- and biphotonic pathways are involved in the photoionization process. A phenoxy radical generated after photoionization has been characterized as the main transient species involved in the photodegrdn. A cross combination reaction between phenoxy and aryl radicals is controlled by the persistent radical effect and is responsible for the formation of the stable photoproduct.
Transient Photochemistry of Diflunisal: Photoejection and Trapping of Hydrated Electrons Leading to the Formation of Phenoxy Radicals, Photostimulated Defluorination, and Cross Combination Reaction
SORTINO, Salvatore;
1999-01-01
Abstract
The transient photochem. of Diflunisal has been investigated in aq. soln. The photoreactivity of the compd. is quite unusual for fluorinated derivs. The loss of fluoride does not occur from an excited state, as expected, but is photostimulated through a reaction involving trapping by the ground state of electrons photoejected from Diflunisal. Mono- and biphotonic pathways are involved in the photoionization process. A phenoxy radical generated after photoionization has been characterized as the main transient species involved in the photodegrdn. A cross combination reaction between phenoxy and aryl radicals is controlled by the persistent radical effect and is responsible for the formation of the stable photoproduct.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
