- 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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- Herbicidal 12-substituted 12H-dibenzo(D,G)(1,3)dioxocin-6-carboxylic acids
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Dibenzo[d,g][1,3]dioxocin-6-carboxylic acids substituted by methyl or ethyl or a moiety --CH2 CH2 -- at the 12-position and optionally substituted at other positions, such as methyl 4'-chlorospiro(cyclopropane-1,12'(12'H)-dibenzo[d,g][1,3]dioxocin)-6'-carboxylic acid, and their agriculturally acceptable esters, amides, and salts are useful for the control of undesirable vegetation. The 1,1-diarylcyclopropane intermediates required for the spirocyclopropane compounds can be prepared from appropriately substituted 1,1-diarylethene procursors by reaction with phenylthiomethyl lithium reagent.
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- REACTION OF PHENOL WITH ACETONE IN THE PRESENCE OF ALUMINUM PHENOLATE
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The condensation of phenol with acetone in the presence of aluminum phenolate leads to a mixture of isomeric bis(hydroxyphenyl)propanes and 2'- and 4'-hydroxy-2,4,4-trimethylflavans, in which 2-(2-hydroxyphenyl)-2-(4-hydroxyphenyl)propane usually predominates.
- Kozlikovskii, Ya. B.,Chernyaev, B. V.
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p. 512 - 514
(2007/10/02)
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