反应详情

The 5-nitrosalicyloyl chloride thus obtained was dissolved in dry toluene (40 ml) and treated with anhydrous 5-aminotetrazole (3.4 g) and the mixture was stirred and heated at reflux for 12 hours. The mixture was then allowed to cool and was treated with petroleum ether (b.p. 40°-60° C.; 40 ml). The resulting solid was filtered off, washed with petroleum ether (b.p. 40°-60° C.) and stirred with hydrochloric acid (2N; 100 ml). The undissolved solid was filtered off, washed with hydrochloric acid (2N) and with water, and was then dried and dissolved in glacial acetic acid (750 ml). The solution was filtered hot and was then concentrated to 150 ml volume and was then cooled and filtered to give 2-hydroxy-5-nitro-N-(tetrazol-5-yl)-benzamide (2.2 g), m.p. 271°-272° C. (with decomposition).

1. temperatureheated
2. temperatureat reflux for 12 hours
3. temperatureto cool
4. filtrationThe resulting solid was filtered off
5. washwashed with petroleum ether (b.p. 40°-60° C.)
6. stirringstirred with hydrochloric acid (2N; 100 ml)
7. filtrationThe undissolved solid was filtered off
8. washwashed with hydrochloric acid (2N) and with water
9. customwas then dried
10. dissolutiondissolved in glacial acetic acid (750 ml)
11. filtrationThe solution was filtered hot
12. concentrationwas then concentrated to 150 ml volume
13. temperaturewas then cooled
14. filtrationfiltered