1273 demonstrate a dramatic enhancement of phenyl migration by the gem-dimethyls and point out the importance of the structure of the nonmigrating group in migratory aptitude studies.
Acknowledgment. We thank Professor J. C. Dalton and Mr. James Snyder of the University of Rochester and Professor Alan Waggoner of Amherst College for help in determining the singlet lifetimes, and the donors of the Petroleum Research Fund, administered by the American Chemical Society, for financial support. References and Notes See, e.g., (a) G. W. Griffin, J. Covell, R. C. Petterson, R. M. Dodson, and G. Close, J. Am. Chem. SOC., 87, 1410 (1965);(b) H. Kristinsson and G. W. Griffin, ibid., 88, 378 (1966);(c) G. W. Griffin, A. F. Marcantonio. H. Kristinsson. R. C. Petterson, and C. S. Irving, Tetrahedron Len., 2951 (1965);(d) S. S. Hixson, ibid., 1155 (1972);(e) P. H. Mazzocchi, and R. C. Ladenson, private communication; (f) H. E. Zimmermann and J. A. Pincock, J. Am. Chem. SOC.,95, 2957 (1973). (a) S.S. Hixson. J. Am. Chem. Soc.,94, 2507 (1972):(b) S. S.Hixson and T. P. Cutler, ibid., 95, 3032 (1973).The quantum yields shown in Table I of this reference are 0.0010,0.0026,and
