| 摘要 |
The invention relates to a novel process for preparing 4,6-diaminoresorcinol, a precursor to polybenzoxazole, from resorcinol according to the following scheme. <IMAGE> <IMAGE> <IMAGE> Resorcinol (I) is reacted with a di-tert-alkylating reagent to form a 4,6,-di-tert-alkylresorcinol (II), which is then halogenated to form a 2-halo-4,6-di-tert-alkylresorcinol (III). The 2-halo-4,6-di-tert-alkylresorcinol is nitrated in one of two ways to form a 2-halo-4,6-dinitroresorcinol (IV), which is then hydrogenated to from the 4,6-diaminoresorcinol. The invention also relates to a novel chemical composition-2-halo-4,6-di-tert-alkylresorcinol (III )-and a process for preparing same.
|
