| 摘要 |
Preparation of 4,6-bis((optionally substituted) phenylazo)resorcinol (II) comprises reacting an (optionally substituted) benzene diazonium salt of formula (I) with resorcinol in an alkaline solvent, as follows. (a) a solution of (I) is mixed with a solution or suspension of a metal hydroxide (III), and the alkaline liquid mixture is then mixed and reacted with resorcinol (optionally as a suspension or solution containing a metal salt (IV)); or (b) resorcinol and (I) are reacted in the presence of metal hydroxides at mole ratio metal hydroxide:resorcinol of 15-40:1. The metal in (III) and (IV) is an alkali or alkaline earth metal; R = independently halo, 1-5C alkyl, hydroxycarbonyl or 1-5C alkoxy; n = 0-5; and X = Cl, Br, OSO3H or OPO3H2. |
