... (4) (a) C. K. Ingold, "Struoture and Mechanism in Organic Chemistry," Cornell University Press, Ithaca, N. Y., 1983, p 562; (b) PB de la Mare, J. Chem. ~oc., 1602 (1962). ... 1M) 80 60 8 -3 rl B g 40 w 2c J. Org. Chem., Vol. 35, No. 10, 1970 3353 Y 8 I I , ... . I ...