摘要:
1,1,1,4,4,4-hexafluoro-chlorobutenes are obtained by pyrolysis of 1,1,1-trifluoro-2,2-dichloroethane. The hexafluoro-chlorobutenes obtained in this way can be converted into hexafluorobutane, a CFC substitute, by hydrogenation.
摘要:
The invention relates to new 3-thiocarbarnoylpyrazole derivatives of the formula (I) in which Ar represents in each case optionally substituted phenyl or pyridyl, R1 represents H2N—CS— and R2 and R3 are as defined in the description, to a plurality of processes for their preparation and to their use as pesticides.
摘要:
Avoiding hexachlorobutadiene as the starting material, 2-chloro- and 2,3-dichloro-1,1,1,4,4,4-hexafluoro-2-butene are prepared by reacting a chlorobutene derivative of the formula (I)Cl.sub.2 C.dbd.CH-X (I)in whichX represents CCl.dbd.CCl.sub.2 or CCl.sub.2 --CCl.sub.2 H with hydrogen fluoride and chlorine in the presence of a catalyst at temperatures in the range of 50 to 550.degree. C.
摘要:
1,1,1,4,4,4-Hexafluorobutane (R 356) can be obtained in a simple manner and in excellent yields and with excellent selectivities when 1,1,1,4,4,4-hexafluorobutene is reacted in the liquid phase with hydrogen in the presence of a noble metal catalyst.
摘要:
1,1,1,4,4,4-Hexafluorobut-2-ene is prepared from chloro-fluorobutanes of the formula (I)CF.sub.3 --CH.sub.2 --CHCl--CX.sub.3 (I)in which the individual radicals X independently of each other represent chlorine and/or fluorine, by reaction with alkali metal fluoride in an aprotic polar solvent.
摘要:
Halogenated aromatics are prepared by heating halogenoformic acid esters to 80.degree. to 280.degree. C. in the presence of hydrogen fluoride or a catalytic amount of one or more Lewis acids from the group comprising aluminium halides, iron halides and antimony halides, and in the liquid phase.
摘要:
1,1,1,4,4,4-Hexafluorobutane is prepared by first reacting 1,1,3,4,4-pentachlorobuta-1,3-diene with hydrogen fluoride in the presence of catalysts at 60.degree. to 180.degree. C. to give 1,1,1,4,4,4-hexafluoro-2-chlorobutane, and converting this to 1,1,1,4,4,4-hexafluorobutane. On working up the product of the first stage of the process, it is possible to isolate novel compounds of formula (I):CF.sub.2 X--CH.sub.2 --R (I)in whichX is fluorine or chlorine andR is --CHCl--CF.sub.2 Cl, --CHCl--CFCl.sub.2 or --CCl.dbd.CCl.sub.2.
摘要:
Process for the preparation of .beta.-fluoroalcohols of the formula (I) ##STR1## in which R.sup.1 and R.sup.2 represent straight-chain or branched alkyl andR.sup.3 and R.sup.4 represent hydrogen or alkyl,in which epoxides of the formula (II) ##STR2## are reacted with sodium hydrogen fluoride or potassium hydrogen fluoride under pressure in the presence of diluents.
摘要:
1,1,1,2,4,4,4-Heptafluoro-2-butene and 2-chloro-1,1,1,4,4,4-hexafluoro-2-butene 1,V5VjV9are prepared simultaneously by reacting hexachlorobutadiene with hydrogen fluoride with the addition of catalytic amounts of titanium halide, antimony trihalide and/or antimony pentahalide.
摘要:
Polyfluoroalkanes are used as propellants in sprayable compositions or in the the preparation of plastic foams and in the electrical industry as cleansing and degreasing agents.