... 1219 J. Heterocyclic Chem., 31, 1219 (1994). Introduction. ... Page 6. 1224 С.-Y. Qian, J. Hirose, H. Nishino and K. Kurosawa Vol. ... Chemical shifts are shown in ô values (ppm). The ir spectra were measured on a JASCO A- 102 IR spectrometer and expressed in v values (cm1). ...