Experimental Compounds I, 11, 111, IV, and VI1 wrc prrpared by the methods of Bu'lock and Smith.2*4 I11 had the same melt- ing point, ultraviolet and infrared spectra as those recorded in the 1iterrtture.lg The proton magnetic resonance spectra were obtained on ... TABLE I CHEMICAL SHIFTS~ (IN 7, PPM) AND SPIN-SPIN COUPLING CONSTANTS (IN cPs) ... Ha Hs H8 HI He J86 J7s JSl Jsi ... I 4.50 4.07 3.51 2.53 2.0 16.0 ... I1 4.52 4.06 3.49 2.59 2.0 16.0
