... Select a Journal or Book ... 25,26 However, attention has turned to nitrogen heterocycles such as 1,2,4-triazoles, 1,3,5-triazine, or quinoxalines because oxadialzoles have not ... 82 °C. 1 H NMR (CDCl 3 , 300 MHz, ppm): δ 3.48 (2H, t, J = 7.51 Hz, CH 2 ), δ 4.97 (2H, t, J = 7.51 Hz ...