1. M.S. Ramachandran, T.S. Vivekanandam: J. Chem. Soc., Perkin Trans. 2, 1341 (1984).
2. M.S. Ramachandran, T.S. Vivekanandam, R.P. Malim Mani Raj: J. Chem. Soc., Perkin Trans. 2, 1345 (1984).
3. F.G. Mann, B.C. Saunders: Practical Organic Chemistry, 4th edition, p. 463. ELBS and Longman Group, Ltd., London 1974.
4. R.P. Bell: Advan. Phys. Org. Chem.,4, 1 (1968).
5. M.S. Ramachandran, T.S. Vivekanandam, V. Arunachalam: Bull. Chem. Soc. Japan (in press).