... ALthough the importance of electron transfer in photochemistxy has been known evesince the fundamental work of Weller et a12, its synthetic useful- ness in organic chem- has started getting prominence now only3. ... Pandey, G., Kdshna, A. and Rao, JM, Tetrahedron Letters, 1986, 27, 4075. ++nn+V- G. and Krishna, A., J. Ory. Chem., 1988, 53, 000. Pandey, G. and K dshna , A., M ane undw preparation. Albi~& A., F& E. and M&, M., J. Am. Chem. Scc., ...