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US 8,524,923 B2Granted
Processes for preparing diacids, dialdehydes and polymers
AssigneeE. I. Du Pont de Nemours and Company
InventorsVladimir Grushin, Leo Ernest Manzer, Walter Partenheimer
Life of this patent
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Abstract
Alcohols are catalytically oxidized to aldehydes, in particular to benzaldehyde and diformylfuran, which are useful as intermediates for a multiplicity of purposes. The invention also relates to the polymerization of the dialdehyde and to the decarbonylation of the dialdehyde to furan.
Claims9
A process for the preparation of a diacid of the formula HOOC—R′—COOH from an alcohol/aldehyde of the formula HOH2C—R′—(C═O)H, wherein R′ is an optionally substituted furan ring, comprising the steps:
- (a) contacting the alcohol/aldehyde with an oxidant in the presence of a metal bromide catalyst forming a dialdehyde having the formula H(C═O)—R′—(C═O)H, and optionally isolating the dialdehyde;
- (b) contacting the dialdehyde with an oxidant in the presence of a metal bromide catalyst forming an acid/aldehyde having the formula HOOC—R′—(C═O)H, and optionally isolating the acid/aldehyde;
- and
- (c) contacting the acid/dialdehyde with an oxidant in the presence of a metal bromide catalyst forming the diacid, and optionally isolating the diacid.
1 more element
Dependencies are inferred from the claim text.