2 HETEROCYCLIC 1,2,4,5-TETRAZINES

The title compounds, bromo-1,4-di(o-tolyl)-1,2,4,5-tetrazine-3(2H)-one , C(16)H(15)BRN(4)O, and romo-1,4-dihydro-1,4-bis(p-methoxyphenyl)-1,2 ,4,5- tetrazine, C16H14Br2N4O2, were prepared from 4-bromo-3-(o-tolyl) sydnone and 4-bromo-3-(p-methoxyphenyl)sydnone, respectively, in thf u nder ultrasonic irradiation, and identified with IR, H-1 NMR, mass spe ctrum and elemental analyses. The heterocyclic rings of both title com pounds appear to lack aromatic character, as judged from the bond leng ths.