At this stage the electronic spedtrum of the solu- 1. D. E. HARRISON and H. TAUBE. J. Ani. Chem. Soc. 89, 5706 (1967). showed a band at 263 mp and a weak 2. A. D. ALLEN and C. V. SENOFF. Chem. Comniun. 621 band at 221 mp. Addition of a filtered solution (1965). of sodium fluoborate to the filtered reaction 3. D. E. HARRISON, E. WEISSBERGER, and H. TAUBE. Private communication. To be published. solution gave a yellow precipitate. The infrared 4. A. D. ALLEN, F. BOWOMLEY, R. O. HARRIS, V. P. and electronic