反应详情

A vigorously stirred solution of 487 ml concentrated hydrochloric acid and 218 ml of water at 0° C. was treated dropwise with 1.93 moles (234 g) of 2-ethylaniline. To the resulting thick suspension was added a solution of sodium nitrite (143 g, 2.07 moles) in 218 ml of water over 1.5 hours while maintaining the internal temperature between 8° C. and 14° C. Next, a solution of SnCl2.2H2O (4.37 moles, 985 g) in 1.312 l of 1:1 concentrated hydrochloric acid:water was added over 5 hours while the internal temperature was kept between 5° C. and 10° C. After 15 hours, the solid was collected on a filter paper and boiled in 1.2 l of water with decolorizing carbon. The solution was filtered through Celite, treated with 400 ml of concentrated hydrochloric acid and put in an ice bath for 0.5 hours. The tan plates were filtered and dried in vacuo over phosphorous pentoxide for 24 hours affording title compound, m.p. 181°-183° C.

1. temperaturewhile maintaining the internal temperature between 8° C. and 14° C
2. customwas kept between 5° C. and 10° C
3. customthe solid was collected on a filter paper
4. filtrationThe solution was filtered through Celite
5. additiontreated with 400 ml of concentrated hydrochloric acid
6. waitput in an ice bath for 0.5 hours
7. filtrationThe tan plates were filtered
8. dry with materialdried in vacuo over phosphorous pentoxide for 24 hours