67118-55-2

Usage

InChI:InChI=1/C6HF11O3.K/c7-2(1(18)19,4(10,11)12)20-6(16,17)3(8,9)5(13,14)15;/h(H,18,19);/q;+1/p-1

Upstream product

• 1644-11-7 1,1,1,2,3,3-hexafluoro-2-(heptafluoropropoxy)-3-[(trifluorovinyl)oxy]propane 
• 13140-34-6 methyl undecafluoro-2-methyl-3-oxahexanoate 
• 2062-98-8 perfluoro(2-propoxypropionyl) fluoride 

Downstream Products

• 13252-13-6 2,3,3,3-tetrafluoro-2-(heptafluoropropoxy)propanoic acid 
• 13140-34-6 methyl undecafluoro-2-methyl-3-oxahexanoate 

Relevant academic research and scientific papers

Application of perfluoro(2-propoxypropyl vinyl ether) (PPVE-2) in the synthesis of perfluoro(propyl vinyl ether) (PPVE-1)

A novel preparative method for the conversion of n-C3F7OCF(CF3)CF2OCF = CF2 (PPVE-2) into n-C3F7OCF = CF2 (PPVE-1) is reported. It includes the catalytic oxidation of PPVE-2 with molecular oxygen to furnish a mixture of carbonyl fluorides which are subjected to alkaline hydrolysis resulting in a mixture of salts. Subsequent thermolysis of those salts give rise to an inseparable mixture of PPVE-1 and perfluoro-2-propoxypropanoyl fluoride. Treatment of this mixture with sodium carbonate allowed to obtain sodium perfluoro-2-propoxypropionate and to isolate PPVE-1. Thermolysis of this sodium salt produced an additional amount of PPVE-1, so that the total conversion of PPVE-2 into PPVE-1 is accomplished in good yields. The reaction conditions, the choice of reagent as well as the course of competitive reactions are discussed.

Method for preparing perfluoropolyether carboxylic acid

The invention discloses a method for preparing perfluoropolyether carboxylic acid. The method comprises the steps that (1) perfluoropolyether Rf-COF is used as raw materials to react with alcohol under the existence of fluoride to produce perfluoropolyether ester; (2) the perfluoropolyether ester reacts with basic salt to produce perfluoropolyether carboxylate; (3) the perfluoropolyether carboxylate reacts with concentrated sulfuric acid, then, distillation is performed to obtain the perfluoropolyether carboxylic acid. Compared with the prior art, the method has the advantages that the generation of a great amount of hydrofluoric acid and fluorinions is avoided; the corrosion on equipment is low; the product yield is high; the water content and the fluorinion content in the product are low.