... Department of Chemistry, Baker Laboratory, Cornel1 University, Zthaca, New York 14853 ... The organic layer was dried (Na2S04) and concentrated to give 0.5977 g (98.3%) of 9 as a mixture of ... 1780,1710,1445,1355,1160,860 cm-'; 'H NMR (CDCl,, 300 MHz) 6 5.06 (t, J = 9 Hz, 1 ...