... 3. J. W. Hancock, C. E. Morrel and D. Rhom, Tetrahedron Lett., 987 (1962). 4. J. March, “Advanced Organic Chemistry”, 3rd Edition, Wdey Eastern Reprint, New Delhi, 1986, p. 295. ... Volume 23, No. ... AN IMPROVED PREPARATION OF A TRICYCLIC LACTONE, A POTENTIALLY ...