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 preparation of .alpha.-fluoroacryloyl derivatives
申请人:Bayer Aktiengesellschaft
公开号:US05124476A1
公开(公告)日:1992-06-23
.alpha.-Fluoroacryloyl derivatives are prepared by reacting a dihalogenopropene with an anhydrous mixture of nitric acid and hydrofluoric acid to give a 1-nitro-2,2-fluorohalogeno-3-halogenopropane, converting this in the presence of a strong acid and a little water at elevated temperature to a 2,2-fluorohalogeno-3-halogenopropanoic acid, converting this into an ester or an amide and finally treating this with a dehalogenating agent.
TALYBOV, A. G.;MURSAKULOV, I. G.;GUSEJNOV, M. M.;SMIT, V. A., IZV. AN CCCP. CEP. XIM., 1982, N 3, 654-657
作者:TALYBOV, A. G.、MURSAKULOV, I. G.、GUSEJNOV, M. M.、SMIT, V. A.
DOI:——
日期:——
Synthese von α-Fluoracrylsäure und Derivaten
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.
Reaction of haloolefins with nitronium tetrafluoroborate
作者:A. G. Talybov、I. G. Mursakulov、M. M. Guseinov、V. A. Smit