CAS: 16523-31-2; 4,6-Diaminobenzene-1,3-Diol Dihydrochloride

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专利信息

专利号:US-5371291-A
优先权日:1993-10-15
标 题:Synthesis of 4,6-diaminoresorcinol
发明人：NADER BASSAM S
权利人:DOW CHEMICAL CO
摘要:The invention is a new process for preparing 4,6-diaminoresorcinol, a precursor to polybisbenzoxazoles. The desired product is prepared from resorcinol by incorporating a halo group on the 2-position of resorcinol to form 2-haloresorcinol, then nitrating selectively at the 4- and 6-positions of the 2-haloresorcinol to form 2-halo-4,6-dinitroresorcinol, then hydrogenating the 2-halo-4,6-dinitroresorcinol. The selective incorporation of a halo group on the 2-position of resorcinol is accomplished by sulfonating resorcinol at the 4- and 6-positions. The following scheme illustrates the synthetic route used to prepare 4,6-diaminoresorcinol from resorcinol: ##STR1##

专利号:US-5410083-A
优先权日:1993-10-15
标题 :Synthesis of diaminoresorcinal from resorcinol
发明人：NADER BASSAM S
权利人:DOW CHEMICAL CO
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. ##STR1## 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. n The invention also relates to a novel chemical composition-2-halo-4,6-di-tert-alkylresorcinol (III )--and a process for preparing same.

专利号:US-5142021-A
优先权日:1990-10-19
标 题:Use of reducing agents in polybenzazole synthesis
发明人：LYSENKO ZENON; ROSENBERG STEVEN; HARRIS WILLIAM J
权利人:DOW CHEMICAL CO
摘要:Polybenzazole polymers are conveniently synthesized in the presence of a reducing agent, such as tin (II) chloride.