反应详情

温度

5 °C

o-Tolyl isocyanate (10.0 g) was dissolved in 75 mL toluene under N2. The solution was cooled to 5° C. and to this was slowly added a solution in toluene of 1,1-dimethylhydrazine (5.7 mL). After addition, the ice-bath was removed and the resulting slurry allowed to stir an additional 10 minutes. The solid was filtered off rinsing successively with hexane, a small amount of 20% diethylether/hexane, then hexanes again. This afforded 11.1 g (77%) of the title compound of Step A. 1H NMR (CDCl3) δ 8.1 (bs,1H), 7.94 (d,1H), 7.21-7.15 (m,3H), 6.99 (t,1H), 5.23 (bs,1H), 2.63 (s,6H), 2.27 (s,3H).

1. additionAfter addition
2. customthe ice-bath was removed
3. filtrationThe solid was filtered off
4. washrinsing successively with hexane