反应详情

A suspension of 3-methoxyaniline (10 g) in concentrated hydrochloric acid (85 ml) was stirred at ca. 0° and a solution of sodium nitrite (5.75 g) in water (25 ml) was slowly added over a period of 30 min keeping the temperature of the mixture at ca. 0°. After 1 h a solution of tin II chloride dihydrate (59 g) in concentrated hydrochloric acid (50 ml) was added over a period of 1.5 h, to the cooled suspension keeping the temperature below 0° C. The suspension was stirred for a further 30 min, filtered and washed with dried ether to give the title compound as a solid (14 g) m.p. 171°.

1. customat ca. 0°
2. customthe temperature below 0° C
3. stirringThe suspension was stirred for a further 30 min
4. filtrationfiltered
5. washwashed with dried ether