Photochemistry of substituted

Hilborn, J.W., MacKnight, E., Pincock, J. A. and Wedge, P.J. (1994) Photochemistry of substituted benzyl acetates and benzyl pivalates a reinvestigation of substituent effects. Journal of the American Chemical Society, 116, 3337-3346. 

The photochemistry of substituted 1,3-dienes (chiefly alkyl substituted) has been studied for the most part only from a qualitative point of view. The reactions which have been uncovered have been reviewed. Quantitative data, where they have been obtained, pertain to a definite reaction in a variety of substituted dienes. 

The photochemistry of substituted thiophenes has recently opened up a new and stimulating field of reaserch in heterocyclic compounds, due to the efforts of Wynberg et al.. The photochemical rearrangement of 2-phenylthiophene into 3-phenylthiophene... 

The photochemistry of substituted furans can be very complex indeed and may differ considerably from that found for benzenoid compounds. However, the photocyclization of 2,2 -ethylenedifuran to a benzodifuran is a simple reaction that is an exact counterpart to the photocyclization of stilbene to phenanthrenes.19 Some side chains allow ready dissociation to radicals typical is the nitro group and Scheme 4 displays what happens to irradiated... 

One reason for the rather low quantum yields for product formation from Z-1,3,5-hexatriene is thought to be that the ground state conformer distribution is heavily weighted in favor of the relatively unreactive fZf-conformer . Substituents and structural constraints have quite substantial effects on the conformer distribution, and hence on the quantum yields and distribution of products obsCTved. These effects are well understood, having been worked out independently by Havinga and coworkers, who examined the photochemistry of various 2-alkyl- and 2,5-dialkyl-l,3,5-hexatrienes (120 and 121, respectively) , and by Dauben and coworkCTs with their studies of the photochemistry of substituted 6,6,9,9-tetramethyl-A -hexalins (122). Both bodies of work were predicated on the effects of substituents at the 2- and/or 5-positions of the... 

Decosta, D. P., Pincock, J. A., Photochemistry of Substituted 1 Naphthylmethyl Esters of Phenylacetic and 3 Phenylpropanoic Acid Radical Pairs, Ion Pairs, and Marcus Electron transfer, J. Am. Chem. Soc. 1993, 115, 2180 2190. 

DeCosta, D. P. and Pincock, J. A., Intramolecular electron transfer in the photochemistry of substituted 1-naphthylmethyl esters of benzoic acids, Can. J. Chem., 70, 1879, 1992. 

There are limited data concerning the photochemistry of substituted ketenes. The absorption spectram of methylketene as reported by Chong and Kistiakowsky (1964)... 

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