... J(F,C) (Hz] in parentheses. Page 6. HELVETICA CHIMICA ACTA - Vol. 71 (1988) 60 1 9.2.2-Dimethyl-7- (trcfluoromethyl)-2H-pyrano/2,3- blpyridine (13b). H 2 0 elimination from ltb as described above yielded, after recrystallization from EtOH/H,O, 78% of 13b. Mp 6465". ...