Considerable effort has been devoted over the past decade to the exploration of potential synthetic routes to compounds in the eremophilane-valencane family of sesquiterpenes.'f2 A major problem in this con-(1)(a) D. Herbst and C. Djerassi, J. Amer. Chem. Soc., 82, 4337 (1860);(h) RF Church, RE Ireland, and DR Shridhar, J. Org. Chem., 97, 707 (1962);(0) JA Marshall, H. Faubl, and TM Warne, Jr., Chem. Commun., 753 (1967);(d) RM Coates and ...
