1. N. S. Narasimhan, M. V. Pradkar andS. L. Kelkar, Indian J. Chem.8, 473 (1970).
2. S. P. Kureel, R. S. Kapil andS. P. Popli, Chem. Commun.1969, 1120.
3. All new compounds were characterized by full spectroscopic studies.
4. We are grateful to Dr.N. S. Narasimhan, Poona, for supply of a sample of mahanine.