反应详情

Zinc powder (10.0 g; 0.15 mol) was added to a stirred mixture of 4-methoxyazobenzene (4.24 g; 20.0 mmol) in 96% ethanol (75 ml) and saturated NH4Cl solution (2.0 ml) at 0° C. (bath temperature). Two more portions of saturated NH4Cl solution (2.0 ml) were added at 1.5 h intervals. The yellowish solution was poured into cold water (100 ml) and filtered. The residue was extracted with methylene chloride (5×50 ml). The combined aqueous phases were extracted with methylene chloride (3×25 ml). The combined organic solutions were,dried (Na2SO4), filtered and evaporated to give 4.3 g crude 1-(4-methoxyphenyl)-2-phenylhydrazine as a reddish oil.

1. filtrationfiltered
2. extractionThe residue was extracted with methylene chloride (5×50 ml)
3. extractionThe combined aqueous phases were extracted with methylene chloride (3×25 ml)
4. filtrationfiltered
5. customevaporated