[A] having high yield and purity of the di-acid specific structure simple and safe method for manufacturing. General formula [a]: ICF2 CF2 The fuming sulfuric acid is oxidized by ORf [...] shown, general formula: FCOCF2 After obtaining the di-acid ORf shown, the di-acid reaction with hexafluoropropylene oxide, having the general formula FCOCF (CF3 ) OCF2 CF2 As shown in the di-acid ORf production. [Drawing] no
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Paragraph 0101; 0104-0106
(2018/04/03)
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