... Soc.. (5) R. 1%'. Tsft, Jr., “Steric Effects in Organic Chemistry,” M. S. Sewman, (6) G . W. Sneilecor, “Statistical Methods,” 6th ed, The Iowa State (a) Chapter 14; (b) ~ ~ 4 6 , 4 1 8 , and 441: ... (12) G. W. Wheland. ”Resonance in Organio Chemistry,” Wiley, New ... J . Org. Chern., Vol. ...