Synthesis of vinyl ether compounds by pyrolysis of dimethyl perfluoro-2,7-dimethyl-3,6-dioxa-1,8-octanedioate

Article abstract of DOI:10.1016/0022-1139(95)03316-1

Dimethyl perfluoro-2,7-dimethyl-3,6-dioxa-1,8-octanedioate (1) is pyrolyzed over Na2CO3, K2CO3, CaCO3, BaCO3 and ZnO to give mixtures containing perfluoro-3,6-dioxa-1,7-octadiene (2) and methyl perfluoro-2-methyl-3,6-dioxaoctanoate-7-ene (3).The pyrolysis conditions necessary to obtain these vinyl ethers require a higher temperature for the divalent metal compounds than for the monovalent.Increase in the pyrolysis temperature and decomposition time result in an increasing conversion of 1.At lower temperatures the pyrolysis product is mainly 3.However, the formation of 2 increases with increasing decomposition temperature.Dimethyl carbonate was found in the decomposition product of the pyrolysis of 1 over Na2CO3, K2CO3. - Keywords: Pyrolysis; Dimethyl perfluoroalkanedioate; Perfluorodivinyl ether; Methyl perfluorovinylalkanoate; Metal carbonate