(16) Satisfactory high-resolution mass spectral data were obtained. (17) Lau, PWK; Chan, TH Tetrahedron Lett. 1978, 2383. (18) (a) Cunico, RF; Dexheimer, EM J. Am. Chem. SOC. 1972,94, 2868. (b) Miller, RB; Reichenbach, T. Tetrahedron Lett. 1974,543. (c) Miller, RB; McGarvy, GJ Org. Chem. 1978, 43, 4424. ... Katzenellenbogen of the University of Illinois for helpful discussions. Supplementary Material Available: 'H and 13C NMR, IR, and mass ...