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.
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.
Verfahren zur Herstellung von alpha-Fluoracrylsäurederivaten
申请人:BAYER AG
公开号:EP0415214A2
公开(公告)日:1991-03-06
α-Fluoracrylsäurederivate werden hergestellt, indem man ein Dihalogenpropen mit einem wasserfreien Gemisch aus Salpetersäure und Fluorwasserstoffsäure zu einem 1-Nitro-2,2-fluorhalogen-3-halogenpropan umsetzt, dieses in Gegenwart einer starken Säure und wenig Wasser bei erhöhter Temperatur zu einer 2,2-Fluorhalogen-3-halogenpropionsäure umwandelt, diese in einen Ester oder ein Amid überführt und abschließend mit einem Dehalogenierungsmittel behandelt.
作者:K.-R. Gassen、D. Bielefeldt、A. Marhold、P. Andres
DOI:10.1016/s0022-1139(00)80116-5
日期:1991.12
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.