反应详情

1,1-Dimethylethyl 2-[3-[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]-1-oxo-2-propenyl]hydrazinecarboxylic acid (4.3 g, 0.011 mole) in absolute ethanol (20 ml) is treated with aqueous 2M HCl (11.0 ml, 1,0.022 mole). The resulting mixture is heated on a steam-bath for one hour. The mixture is stripped of volatiles under reduced pressure and the residue partitioned between ether and water. The layers are separated and the aqueous phase is treated with saturated aqueous NaHCOa until basic. The product is extracted out with a mixture of 1:1 ethyl acetate/ether. The organic extract is washed with saturated aqueous NaCl and dried over MgSO4. Filtration and concentration provides a solid which is triturated in hot hexane and filtered to yield 3.0 g (3.2 g theor., 94%) of 3,5-bis(1,1-dimethylethyl)-4-hydroxycinnamic acid hydrazide, mp 166° C.

1. temperatureThe resulting mixture is heated on a steam-bath for one hour
2. customthe residue partitioned between ether and water
3. customThe layers are separated
4. additionthe aqueous phase is treated with saturated aqueous NaHCOa until basic
5. extractionThe product is extracted out with a mixture of 1:1 ethyl acetate/ether
6. extractionThe organic extract
7. washis washed with saturated aqueous NaCl
8. dry with materialdried over MgSO4
9. filtrationFiltration and concentration
10. customprovides a solid which
11. customis triturated in hot hexane
12. filtrationfiltered