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US 2001/0044554 A1Published application
Process for the preparation of 2-methyl-1,3-dicarboxylates
AssigneeDegussa AG
InventorFRANK BAUER
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Abstract
A process for the preparation of a 2-methyl-1,3-dicarboxylate by reaction of a 1,3-dicarboxylate with formaldehyde and hydrogen, where, based on 1 mol of dicarboxylate, from 1.0 to 2.0 mol of formaldehyde are used, and either the reaction mixture or 2-hydroxymethyl-2-methyl-1,3-dicarboxylate isolated therefrom as by-product are subjected to thermolysis at temperatures of from 50° C. to 300° C.
Claims15
A process for the preparation of a 2-methyl-1,3-dicarboxylate of formula I
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- in which R1 and R2 independently of one another, represent a substituted or unsubstituted alkyl, aralkyl, aryl or cycloalkyl group having from 1 to about 12 carbon atoms or are a common part of a hydrocarbon chain, which comprises
- (1) reacting a 1,3-dicarboxylate of formula II
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- with hydrogen and about 1.0 to about 2.0 moles of formaldehyde per mol of said dicarboxylate of formula II, in the presence of a solvent, and a mixture of a hydrogenation catalyst and a Knoevenagel catalyst, and (2) subjecting either the reaction mixture or a compound of formula III
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- isolated therefrom, to thermolysis at a temperature of from about 50° C. to about 300° C.
4 more elements
Dependencies are inferred from the claim text.