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Ultraviolet spectra were recorded on a Cary 14 double-beam recording spectrophotometer. Infrared spectra were taken on a Beckman IR-10 spectrophotometer. Mass spectra were determined on a Hitachi Perkin-Elmer RMU-6D single-focusing mass spectrometer operating at 70 eV. Circular dichroism curves were recorded in n-pentane at room temperature on a Cary 61 spectropolarimeter. Optical rotations were determined on a ETL-NPL (Ericsson Telephone Unlimited) automatic polarimeter. (19) H. Morrison, J. Chem. Educ., 44, 161 (1967). (20) Multiple! collapses to an AB quartet (J = -20 Hz) when Irradiated at 5.6 ppm.(21) Only a carbon-13 nmr spectrum of a 1:1 mixture of 16 and 17 was obtained:

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