[Cl:1][C:2]([F:10])([F:9])[C:3](=[O:8])[CH2:4][C:5](=[O:7])[CH3:6].[CH:11]([O-])([O-])[O:12][CH2:13][CH3:14].C(OC(=O)C)(=O)C>O>[Cl:1][C:2]([F:10])([F:9])[C:3](=[O:8])[C:4](=[CH:11][O:12][CH2:13][CH3:14])[C:5](=[O:7])[CH3:6]A mixed solution containing 50 g of 1-chloro-1,1-difluoro-2,4-pentanedione, 60 g of ethyl orthoformate and 82 g of acetic anhydride was refluxed with stirring for 2 hours. After a Dean-Stark apparatus (water separator) was fixed, the solution was refluxed for additional 4 hours, while about 100 ml of water was removed. After it was allowed to cool, vacuum distillation was conducted to obtain 32.2 g of the desired product as a pale red liquid. Boiling point 95°-118° C./1.6 mmHg.
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