| 简介 |
FIELD : chemistry.
SUBSTANCE : method is realised by reacting C2-C4alkyl ether with pentaerythritol in the presence of a combination of reesterification catalysts consisting of (a) at least one base catalyst selected from a group consisting of compounds of a group Ia alkali metal or a compound of a group IIa alkali-earth metal, (b) at least one compound of a metal which can behave like a Lewis acid, where at least one compound of the metal which behave like a Lewis acid is different from the base catalyst and is selected from a group consisting of zinc octanoate, zinc acetate, hydrate of zinc acetylacetonate, zinc stearate, zinc p-toluene sulphonate, zinc naphthanate, zinc diethylthiocarbamate, manganese (II) acetate, manganese (II) acetylacetonate, manganese (III) acetylacetonate, gallium acetate, lanthanum acetate, hydrate of lanthanum acetylacetonate, aluminium phanate, aluminium isopropoxide, aluminium acetylacetonate, titanium tetrabutoxide, titanium oxide acetylacetonate, isopropoxide bis(acetylacetonate)titanium, zirconium (IV) acetylacetonate and a transition metal compound, and where the reaction is carried out via a first step in which there is only a base catalyst in the reaction mixture, followed by a second step which begins with addition of the said Lewis acid catalyst to the reaction mixture, when the amount of disubstituted intermediate product in the reaction mixture is reduced to less than 20% of the area from HELC analysis data.
EFFECT : design of an improved method of reesterification to produce tetrakis [3-(3, 5-di-tert-butyl-4-hydroxyphenyl)propionyloxymethyl]methane.
9 cl, 48 ex |
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