Three new routes to derivatives of alpha-fluoracrylic acid, including a laboratory synthesis and a large-scale method, are reported. The processes are (i) addition of elementary fluorine to acrylic esters and subsequent elimination of HF; (ii) addition of difluorocarbene to isopropenyl methyl ether, oxidation via ring opening and dehalogenation; and (iii) 'nitrofluorination' of 2,3-dichloropropene, hydrolysis and dechlorination.
Process for the fluorination of acrylic acid and derivatives thereof and
申请人:Bayer Aktiengesellschaft
公开号:US05072030A1
公开(公告)日:1991-12-10
Difluoropropionic acid and derivatives thereof are prepared by bringing elemental fluorine in the presence of a solvent into an addition reaction with appropriate acrylic acids or derivatives thereof. In this way, it is also possible to obtain novel fluorinated esters of 2,3-difluoropropionic acid.