Cleavage photoinduced

Saeva, F. D. Photoinduced Electron Transfer (PET) Bond Cleavage Reactions. 156, 59-92... 

Photochemical elimination reactions include all those photoinduced reactions resulting in the loss of one or more fragments from the excited molecule. Loss of carbon monoxide from type I or a-cleavage of carbonyl compounds has been previously considered in Chapter 3. Other types of photoeliminations, to be discussed here, include loss of molecular nitrogen from azo, diazo, and azido compounds, loss of nitric oxide from organic nitrites, and loss of sulfur dioxide and other miscellaneous species. 

A. S. Boutorine, M. Takasugi, C. Helene, H. Tokuyama, H. Isobe, E. Nakamura, Fullerene-oligonucleotide conjugates-photoinduced sequence-specific DNA cleavage, Angewandte Chemie International Edition in English, vol. 33, pp. 2462-2465,1994. 

An illustrative example for photochemical cleavage of strained ring compounds is provided by Cossy and co-workers. The photoinduced single-electron... 

Scheme 24 Radical formation and addition by photoinduced cleavage of stannyl and silyl derivatives.

The photoinduced -elimination of 1,2,3-triazole from 1-(A,A-bisacyl)amino-l,2,3-triazoles (142), itself formed from the photochemical isomerization of triazoles (141), proceeds either via an intra-or intermolecular hydrogen abstraction or electron-transfer mechanism followed by homolytic cleavage of the A,A-bond (path a) or via t -assisted )8-cleavage of the same weak bond (path b). The composition of the products suggests that in all cases a c-type 1,2,3-triazolyl radical (143) is eliminated which is further quenched by hydrogen abstraction as shown in Scheme 24 <93JHC1301>. 

Saeva FD (1990) Photoinduced Electron Transfer (PET) Bond Cleavage Reactions. 156 59-92 Sahni V (1996) Quantum-Mechanical Interpretation of Density Functional Theory. 182 1-39 Sakai S,see Inokuma S (1994) 172 87-118 Sandanayake KRAS, see Bissel RA (1993) 168 223-264... 

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