Access to 2-fluoroacrylates and their 3-chloro derivatives by chemical hydrogenolysis of 3,3-dichloro-2-fluoroacrylates
摘要:
The formation of 3-chloro-2-fluoroacrylates 2 and 2-fluoroacrylates 3 by hydrogenolysis of 3,3-dichloro-2-fluoroacrylates 1 was studied by using Bu(3)SnH, zinc, the sodium sulphite/sodium formate mixture or iron pentacarbonyl in the presence of a hydrogen donor (Et(3)SiH or CH,OH). The two last couples can be used to prepare the 3-chloro derivatives 2, whereas for the preparation of the 3,3-dihydro derivatives 3, zinc is the most appropriate reducing agent.
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.-fluoroacrylates
申请人:Elf Atochem S.A.
公开号:US05231219A1
公开(公告)日:1993-07-27
Process for the manufacture of .alpha.-fluoroacrylates of general formula: ##STR1## with R' alkyl, aryl or cycloalkyl, according to which source of formalin, consisting of paraformaldehyde is reacted with an .alpha.-fluorophosphonoacetate in aqueous medium in the presence of a salt of a weak inorganic acid.
Bestimmte Ester der α-Fluoracrylsäure sind zugänglich durch Hydrolyse von α-Hydroxymethyl-α-fluormalonsäureestern und anschließende Decarboxylierung des Hydrolyseproduktes. α-Fluoracrylsäurephenylester, die am Phenylrest substituiert sind, sind herstellbar durch Hydroxymethylierung von α-Fluormalonsäuredimethylester, Decarboxylierung und Dehydratisierung des erhaltenen α-Hydroxymethyl-α-fluormalonsäure-dimethylesters und Veresterung der erhaltenen α-Fluoracrylsäure mit substituierten Phenolen. Die substituierten α-Fluoracrylsäurephenylester sind farblose Flüssigkeiten oder farblose Feststoffe, die polymerisierbar sind. Sie eignen sich als Ausgangsmaterial zur Herstellung von Fluorpolymeren.
An adhesive composition for biomaterial use, which comprises as a main component a compound represented by the formula
wherein A is H, F or CH3, B is fluoroalkyl group having 1 to 20 carbon atoms.
An object of the present invention is to provide a macromolecular material that exhibits excellent elongation. The first macromolecular material of the present invention contains the first polymer containing the first structural unit and the second polymer containing the second structural unit. The first structural unit has a guest group in its side chain, and the second structural unit has a host group in its side chain. At least one of the first and the second polymers contains at least one fluorine group. The second macromolecular material of the present invention contains the first structural unit having a guest group in its side chain, the second structural unit having a host group in its side chain, and the third structural unit other than the first and second structural units. At least one of the first, the second, and the third structural units contains at least one fluorine group.