Preparation of difluoroacetic acid fluoride and difluoroacetic acid esters
AssigneeAsahi Glass Company, Limited
InventorsKazuya Oharu, Seisaku Kumai
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Abstract
A method for preparing difluoroacetic acid fluoride, which comprises reacting a 1-alkoxy-1,1,2,2-tetrafluoroethane of the formula HCF.sub.2 CF.sub.2 OR.sup.1 wherein R.sup.1 is a C.sub.1-4 alkyl group in a gas phase in the presence of a metal oxide catalyst.
Claims18
A method for preparing difluoroacetic acid fluoride, which comprises reacting a 1-alkoxy-1,1,2,2-tetrafluoroethane of the formula HCF.sub.2 CF.sub.2 OR.sup.1 wherein R.sup.1 is a C.sub.1-4 alkyl group in a gas phase in the presence of a metal oxide catalyst.
A method for preparing a difluoroacetic acid ester of the formula HCF.sub.2 COOR.sup.2 wherein R.sup.2 is a C.sub.1-4 alkyl group, which comprises reacting a 1-alkoxy-1,1,2,2-tetrafluoroethane of the formula HCF.sub.2 CF.sub.2 OR.sup.1 wherein R.sup.1 is a C.sub.1-4 alkyl group in a gas phase in the presence of a metal oxide catalyst to form difluoroacetic acid fluoride, and reacting the difluoroacetic acid fluoride with an alcohol of the formula R.sup.2 OH wherein R.sup.2 is as defined above.
A method for producing a difluoroacetic acid ester containing substantially no alcohol, which comprises reacting a mixture of a difluoroacetic acid ester of the formula HCF.sub.2 COOR.sup.2 wherein R.sup.2 is a C.sub.1-4 alkyl group containing an alcohol of the formula R.sup.2 OH wherein R.sup.2 is as defined above with difluoroacetic acid fluoride.
Dependencies are inferred from the claim text.