Evidence for carbocation intermediates in the titanium dioxide-catalyzed photochemical fluorination of carboxylic acids

C Lai, YI Kim, CM Wang, TE Mallouk

Index: Lai, Cuiwei; Kim, Yeong Il; Wang, Chong Mou; Mallouk, Thomas E. Journal of Organic Chemistry, 1993 , vol. 58, # 6 p. 1393 - 1399

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Citation Number: 17

Abstract

Laser flash photolysis/transient absorbance spectroscopy was used to determine the mechanism of photo-Kolbe fluorination of carboxylic acids, RCOOH-RF, at colloidal Ti02 suspensions in acetonitrile. Transient absorption spectra of PhaC+, Ph3C*, PhzCH'and Ph2CH+ were observed from the photooxidation of PhaCCOOH and PhzCCOOH at Ti02 using 355-nm excitation. Transient decays, monitored in the presence and absence of ...