摘要:
A process for producing 1,1,1,3,3-pentafluoropropane which involves the first step of reacting in a gas phase 1,1,1,3,3-pentachloropropane with hydrogen fluoride to thereby give 1,1,1-trifluoro-3-chloro-2-propene; and the second step of reacting in a gas phase the above 1,1,1-trifluoro-3-chloro-2-propene with hydrogen fluoride to thereby give 1,1,1,3,3-petafluoropropane; wherein the 1,1,1-trifluoro-3-chloro-2-propene obtained in the first step is fed into the second step after eliminating hydrogen chloride formed as the by-product therefrom. Thus an economical and novel process for producing 1,1,1,3,3-pentafluoropropane can be provided in a high yield or at a good selectivity.
摘要:
A fluorinating reagent represented by general formula (I), and a method of fluorinating an alcoholic hydroxyl group with the same, wherein R represents C1-C5 alkyl or dialkylamino having C1-C3 alkyl groups. The starting material of the reagent can be readily converted into the target compound, is reduced in toxicity and corrosiveness, can be readily prepared and is readily available. An alcoholic compound can be readily fluorinated with this reagent.
摘要:
A method for isolating and purifying 1,1,1,2,2-pentafluoroethyl iodide and hydrogen fluoride from a mixture of them, characterized by distilling an azeotropic mixture of 1,1,1,2,2-pentafluoroethyl iodide and hydrogen fluoride from a mixture containing 1,1,1,2,2-pentafluoroethyl iodide and hydrogen fluoride either after liquid-liquid separation when the mixture is heterogeneous or directly when the mixture is homogeneous to obtain 1,1,1,2,2-pentafluoroethyl iodide or hydrogen fluoride through the bottom of the distillation column.
摘要:
An azeotropic composition comprising cis-1,1,2,2,3,4-hexafluorocyclobutane and at least one compound selected from the group consisting of methanol, ethanol, isopropaneol, n-propanol, tert-butanol, cyclopentane, n-octane, isooctane, n-heptane and methylcyclohexane; and detergent, drying agent and blowing agent each comprising the same. The composition is reduced in the adverse effects on plastics, excellent in detergency, and reduced in ozonosphere depletion, thus serving as a chlorofluorocarbon substitute.
摘要:
A process for producing hexafluorocyclobutene by dechlorinating 1,2-dichlorohexafluorocyclobutane with hydrogen in the presence of a metal oxide and/or silicon oxide catalyst. A process for producing (Z)-1,2,3,3,4,4-hexafluorocyclobutane either by reducing hexafluorocyclobutene with hydrogen in a vapor phase in the presence of a palladium catalyst or by hydrogenating (reducing with hydrogen) 1,2-dichlorohexafluorocyclobutane in the presence of a rhodium catalyst. An inexpensively available 1,2-dichlorohexafluorocyclobutane can readily be converted into hexafluorocyclobutene in one step at an excellent selectivity. Further it is possible to produce (Z)-1,2,3,3,4,4-hexafluorocyclobutane in a high yield.
摘要:
A process for producing 1,1,2,2,3-pentafluoropropane in a high yield industrially and economically by reacting 1-chloro-2,2,3,3-tetrafluoropropane with hydrogen fluoride in the presence of a fluorination catalyst.
摘要:
Acid chlorides can be produced in high yields from a primary alcohol having a polyfluoroalkyl group and a methylene group by (1) a process wherein RfCH2OH (wherein Rf represents a polyfluoroalkyl group) is reacted with chlorine to form RfCOCl, (2) a process wherein RfCHO is reacted with chlorine to form RfCOCl, or (3) a process comprising the steps of (a) forming an aldehyde (RfCHO) from an alcohol (RfCH2OH), (b) forming a monochloro ester (RfCOOCHClRf) from the aldehyde and an acid chloride (RfCOCl), and (c) forming the acid chloride (RfCOCl) from the monochloro ester.
摘要:
A process for preparing 1,1,1,3,3-pentafluoropropane by reducing 2,3-dichloro-1,1,1,3,3-pentafluoropropane as a raw material with hydrogen in the presence of a catalyst by a vapor-phase process, characterized in that the catalyst is a hydrogenation catalyst comprising palladium and at least one additive metal selected from the group consisting of silver, gold, copper, zinc, rhenium, cobalt, nickel, iridium, ruthenium, rhodium, tantalum, niobium, molybdenum, osmium and tungsten. This process using a hydrogenation catalyst having a long service life permits the preparation of useful 1,1,1,3,3-pentafluoropropane in a high yield, thus being advantageous economically.