Acknowledgment. We are grateful to the National Research Council of Canada for partial support of this work. ... (17) W. D. Closson and P. Haug, J. Amer. Chem. SOC., 86, 2384 (1964). (18) HH Jaffe'and M. Orchin, “Theory and Applications of Ultra- violet Spectroscopy,” John Wiley & Sons, Inc., New York, NY, 1962, pp 179-187. (19) K. Higashi, H. Baba, and A. Rembaum, “Quantum Organic Chemistry,” Interscience Publishers, New York, N. Y., 1965, pp 175- 212. (20) R. ...