- Novel benzoxazine and synthesis method thereof
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The invention discloses a novel benzoxazine and a synthesis method thereof, and belongs to the technical field of chemical synthesis. The synthesis method comprises the following steps: mixing bisphenol A (BPA) with trifluoroacetic acid, heating and react
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Paragraph 0017; 0056-0058
(2021/09/26)
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- PROCESS FOR THE MANUFACTURE OF POLYPHENOLS
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An improved process for the manufacture of a polyphenol compound such as bisphenol-A by introducing into a reaction zone a phenolic compound reactant, a carbonyl compound reactant, and a catalyst promoter comprising bismethylthiopropane added to the reaction system in certain specific locations, and reacting the ingredients within the reaction zone in the presence of an acid catalyst.
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Page/Page column 7
(2009/06/27)
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- IMPROVED PROCESS FOR THE MANUFACTURE OF POLYPHENOLS
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An improved process for the manufacture of a polyphenol compound such as bisphenol-A by introducing into a reaction zone a phenolic compound reactant, a carbonyl compound reactant, and a catalyst promoter comprising bismethylthiopropane added to the reaction system in certain specific locations, and reacting the ingredients within the reaction zone in the presence of an acid catalyst.
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Page/Page column 20-21
(2008/06/13)
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- A practical synthesis and estrogenic activity of 5-hydroxy-1-(4′- hydroxyphenyl)-1,3,3-trimethylindan, a contaminant in industrial grade bisphenol A
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A practical synthesis of 5-hydroxy-1-(4′-hydroxyphenyl)-1,3,3- trimethylindan was achieved from α-methylstyrene. The starting compound was dimerized in the presence of trifluoroacetic acid to produce 1-phenyl-1,3,3-trimethylindan. Aromatic nitration of the phenylindane was carried out using a mixture of nitric acid and acetic anhydride. The nitro group was then converted to hydroxyl via reduction and a diazonium salt sequence to form 5-hydroxy-1-(4′-hydroxyphenyl)-1,3,3-trimethylindan. The estrogenicity of the product was 8.7 times that of BPA. Our finding has demonstrated the endocrine-disrupting properties of the product. Copyright
- Terasaki, Masanori,Shiraishi, Fujio,Nishikawa, Tomohiro,Morita, Masatoshi,Makino, Masakazu
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p. 188 - 189
(2007/10/03)
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