Containing rings (C07C47/17)

ethod for preparing fluorinated derivatives of ethylene-unsaturated compounds // 2281280
FIELD: organic chemistry, chemical technology.SUBSTANCE: invention relates to a method for synthesis of unsaturated compound that can be used as the parent substance for preparing a polymer. Method involves preparing compound of the formula (2): CRbRc=CRdRe wherein each among Rb, Rc, Rd and Re represents independently hydrogen atom, halogen atom or monovalent organic group not changed by the pyrolysis reaction and wherein indicated monovalent organic group represents perfluoroalkyl group, perfluoro (comprising a simple forming ether oxygen atom alkyl) group, perfluoro (partially chlorinated alkyl) group or perfluoro (partially chlorinated and comprising a simple forming ether oxygen atom alkyl) group that comprises from 1 to 20 carbon atoms and so on by pyrolysis of compound expressed by the following formula (1A): RaCOOCF2CRbRc-CXRdRe wherein Ra represents hydrogen atom, halogen atom or monovalent organic group wherein indicated monovalent organic group represents perfluoroalkyl group, perfluoro (comprising forming simple ether oxygen atom alkyl) group, perfluoro (partially chlorinated alkyl) group or perfluoro (partially chlorinated (comprising forming a simple ether oxygen atom alkyl)) group that comprises from 1 to 20 carbon atoms; Rb, Rc, Rd and Re mean abovementioned values; X represents halogen atom. Pyrolysis of compound of the formula (1A) is carried out heating at temperature from 250°C to 450°C. Invention provides preparing a saturated compound for a single step with high yield and by using inexpensive and available compound as the parent material.EFFECT: improved preparing method.11 cl, 8 ex
 
2550940.
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