The optimal conditions for synthesis of alkali green 4 include the carbamide and zinc chloride as catalyst, chloranil and bichrome.
合成碱绿色4的最佳条件包括：尿素和氯化锌作为催化剂，四氢呋喃和双色。
2
The optimal conditions for synthesis of alkali green 4 are reported, including the carbamide and zinc chloride as catalyst, chloranil and bichrome as oxidation agent in the acetic acid medium.