J. Hz, =. , and 5. Ar, 02 (d, 1H a , J = 9, pp.35-42

5. Hz and . Ar, 71 (dq, 1H b' , J 1 = 6.8 Hz and J 2 = 3.6 Hz), 5.39 (d, 1H a, pp.35-42

. Ar, Cq Ar ). anti 12

H. Nmr, 8 (q, C g H, 3 J C-F = 3.6 Hz), pp.90-106

-. and F. Nmr, CDCl 3 , 100 MHz) ?(ppm) syn 123

2. Hz and J. , 9 Hz), 131.4 (t, Cq h , 2 J C-H = 7.4 Hz). anti 123.8 (C i' F 3 ), = 165.3 Hz and 2 J C-H = 6.1 Hz)