1. The utility of photoextrusion in synthesis is well established. For an excellent review see: R. S. Givens, in: Organic Photochemistry, A. Padwa (Ed.), Vol. 5, Ch. 3, p. 273. Marcel Dekker (1981).
2. D. R. Morton and N. J. Turro, Adv. Photochem. 9, 197 (1974).
3. N. J. Turro, W. E. Farneth and A. Devaquet, J. Am. Chem. Soc. 98, 7425 (1976).
4. N. J. Turro, Modern Molecular Photochemistry. The Benjamin/Cummings Publishing Company, Menlo Park, California (1978).
5. R. B. Woodward and R. Hoffmann, in: The Conservationof Orbital Symmetry, p. 152. Academic Press, New York (1970).