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US 4,306,094 AGranted
Preparation of 4,4-dihydroxydiphenyl ethers
AssigneeE. I. Du Pont de Nemours and Company
InventorRaymond J. Shozda
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Abstract
Substituted and unsubstituted 1,4-dihydroxybenzenes are reacted in the presence of a cation exchange resin catalyst and an inert solvent to form the corresponding 4,4'-dihydroxydiphenyl ethers.
Claims10
A process for producing 4,4'-dihydroxydiphenyl ether having the formula:
- ##STR7## comprising condensing 1,4-dihydroxybenzenes of the formula:
- ##STR8## in the presence of an inert solvent and a cation exchange catalyst having a large surface area and strong acid functionality, at a temperature between about 80.degree. to 180.degree. C.;
- wherein R represents the same or different substituents individually selected from hydrogen, alkoxy of up to 4 carbons, alkyl of up to 6 carbons, and halogen;
- said process characterized by a yield of diphenyl ether of 50% or more and a yield of triphenyl ether of 15% or less.
1 more element
Dependencies are inferred from the claim text.