Page 1. Indian Journal of Chemistry Vol. 38B, May 1999, pp. 618-622 ... DM Purohit & VH Shah* Department of Chemistry, Saurashtra University, Rajkot 360 005, India Received 11 April 1997; accepted (revised) 30 March 1999 ... Page 3. 620 INDIAN J CHEM., SEC. B, MAY 1999 ...