反应详情

In 5 volume parts of water is dissolved 0.200 part of 3,4-dihydro-2-amino-5,6-dihydroxy-1(2H)-naphthalenone hydrobromide and, using 0.050 part of platinum dioxide, the catalytic reduction is carried out in a current of hydrogen gas until a substantially stoichiometric amount of hydrogen gas is absorbed. The catalyst in the reaction mixture is filtered off and to the filtrate is added a mixture of ethyl ether, methanol and water. The procedure gives white prisms of 2-amino-1,5,6-trihydroxy-1,2,3,4-tetrahydronaphthalene hydrobromide. Melting point: 190° to 200° C.(decomp.)

1. customis absorbed
2. filtrationThe catalyst in the reaction mixture is filtered off and to the filtrate
3. additionis added
4. additiona mixture of ethyl ether, methanol and water