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US 2022/0017441 A1Published application
Process for preparing a hydroxy compound by means of decarboxylation
AssigneeCovestro Intellectual Property GmbH & Co. KG
InventorsNatalie Bittner, Jens Langanke, Niklas Meine, Jan Heijl
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Abstract
The invention relates to a process for preparing a specific hydroxy compound by means of decarboxylation of a specific carboxylic acid compound or a salt of said carboxylic acid compound, to a method for preparing a diaryl carbonate, a bisphenol or a polycarbonate, a diaryl carbonate or bisphenol, a polycarbonate, and to a method for adjusting the isotope ratio of C14 to C12 in a polymer. A specific solvent is used during decarboxylation.
Claims18
A process for producing a hydroxy compound of the formula (I)
- in which
- R is a linear or branched alkyl group having 1 to 6 carbon atoms,
- n is 1 or 2, and
- m is 0, 1, 2, or 3,
- by decarboxylation of a carboxylic acid compound of the formula (II) or of a corresponding salt of said carboxylic acid compound of the formula (II)
- in which R, n, and m are as defined above,
- using at least one heterogeneous catalyst, wherein the at least one hydroxy compound of the formula (I) is throughout the decarboxylation reaction present in a stoichiometric excess relative to the carboxylic acid compound of the formula (II), the decarboxylation being carried out at a temperature that is above the melting temperature both of the hydroxy compound of the formula (I) that is formed and of the at least one hydroxy compound of the formula (I) used in a stoichiometric excess.
4 more elements
Dependencies are inferred from the claim text.