摘要:
The invention relates to a process for preparing a C3-6 (hydro)fluoroalkene comprising dehydrohalogenating a C3-6 hydro(halo)fluoroalkane in the presence of a zinc/chromia catalyst, wherein the C3-6 (hydro)fluoroalkene produced is isomerised in the presence of the zinc/chromia catalyst.
摘要:
The invention relates to a process for preparing 2,3,3,3-tetrafluoropropene (CF3CF═CH2), performed using the steps of dehydrohalogenating 1,1,1,2,2-pentafluoropropane (CH3CF2CF3, HFC-245ca) 1,1,1,2-tetrafluoro-2-chloropropane, 1,1,1,2,3-pentafluoropropane (CH2FCHFCF3, HFC-245eb) and/or 1,1,1,2-tetrafluoro-3-chloropropane in the presence of a base, and converting a trifluorodichloropropane or a difluorotrichloropropane or a fluorotetrachloropropane to CH3CF2CF3, 1,1,1,2-tetrafluoro-2-chloropropane, CH2FCHFCF3, and/or 1,1,1,2-tetrafluoro-3-chloropropane.
摘要:
A polyvalent vinyl aromatic compound represented by chemical formula (4) is produced by reacting (1) a specific vinyl aromatic compound and (2) a specific vinyl compound in the presence of (3-1) a metal complex and (3-2) a percarboxylic acid or a hypervalent iodine compound so that a vinyl group derived from the vinyl compound is introduced onto a carbon atom that is adjacent to the carbon atom to which a vinyl group is bonded in the vinyl aromatic compound. (In the formula, Ar represents a monocyclic aromatic hydrocarbon group or the like; R1a represents a —CH2OC(═O)R4 group or the like; R2 represents a hydrogen atom or the like; R3 represents a hydrogen atom or the like; A represents an alkyl group having 1-20 carbon atoms, or the like; and n represents an integer of 1-m.)
摘要:
The invention relates to a process for preparing 2,3,3,3-tetrafluoropropene (CF3CF═CH2), performed using the steps of dehydrohalogenating 1,1,1,2,2-pentafluoropropane (CH3CF2CF3, HFC-245ca) 1,1,1,2-tetrafluoro-2-chloropropane, 1,1,1,2,3-pentafluoropropane (CH2FCHFCF3, HFC-245eb) and/or 1,1,1,2-tetrafluoro-3-chloropropane in the presence of a base, and converting a trifluorodichloropropane or a difluorotrichloropropane or a fluorotetrachloropropane to CH3CF2CF3, 1,1,1,2-tetrafluoro-2-chloropropane, CH2FCHFCF3, and/or 1,1,1,2-tetrafluoro-3-chloropropane.
摘要:
A method of fluorination comprising reacting monosaccharides, oligosaccharides, polysaccharides, composite saccharides formed by bonding of these saccharides with proteins and lipids and saccharides having polyalcohols, aldehydes, ketones and acids of the polyalcohols, and derivatives and condensates of these compounds with a fluorinating agent represented by general formula (I) thermally or under irradiation with microwave or an electromagnetic wave having a wavelength around the microwave region. In accordance with the method, the fluorination at a selected position can be conducted safely at a temperature in the range of 150 to 200° C. where the reaction is difficult in accordance with conventional methods. The above method comprising the irradiation with microwave or an electromagnetic wave having a wavelength around the microwave region can be applied to substrates other than saccharides. When a complex compound comprising HF and a base is reacted under irradiation with microwave, fluorination at a specific position which is difficult in accordance with conventional methods proceeds highly selectively, efficiently in a short time and safely.
摘要:
The invention relates to a process for preparing a C3-6 hydrofluoroalkene comprising dehydrohalogenating a C3-6 hydrohalofluoroalkane in the presence of a zinc/chromia catalyst.
摘要:
Mono- or difluorinated hydrocarbon compounds are prepared from an alcohol or a carbonylated compound by reacting one of these with a fluorinating reagent, optionally in the presence of a base, the fluorinating agent comprising a pyridinium reactant having the following formula (F), wherein R0 is an alkyl or cycloalkyl radical:
摘要:
The present invention relates to the use of end groups Y, where Y stands for (formula I), where Rf stands for CF3—(CH2)r—, CF3—(CH2)r—O—, CF3—(CH2)r—S—, CF3CF2—S—, SF5—(CH2)r—, [CF3—(CH2)r]2N—, [CF3—(CH2)r]NH— or (CF3)2N—(CH2)r—, B stands for a single bond, O, NH, NR, CH2, C(O)—O, C(O), S, CH2—O, O—C(O), N—C(O), C(O)—N, O—C(O)—N, N—C(O)—N, O—SO2 or SO2—O, R stands for alkyl having 1 to 4 C atoms, b stands for 0 or 1 and c stands for 0 or 1, q stands for 0 or 1, where at least one radical from b and q stands for 1, and r stands for 0, 1, 2, 3, 4 or 5, as end group in surface-active compounds, to corresponding novel compounds, and to processes for the preparation of these compounds.
摘要:
The present invention is related to a new synthesis for preparing para-phenyl alkynyl benzaldehyde of general formula (I). The compounds of formula (I) are useful building blocks, in particular in the synthesis of electrically conducting polymers. R is selected from the group consisting of C1-C12-alkyl, C1-C12-alkyl aryl, C1-C12-alkyl heteroaryl, C2-C12-alkenyl, C2C12-alkenyl aryl, C2-C12-alkenyl heteroaryl, C2-C12-alkynyl, C2-C12-alkynyl aryl, C2-C12-alkynyl heteroaryl, C3-C8-cycloalkylC1-C12-alkyl-C3-C8-cycloalkyl, C1-C12-alkoxy, aryl, heteroaryl, halides.
摘要:
A method for the deoxofluorination of a ketone for the production of a geminal difluoride compound in an industrial scale comprising the following steps: preparing an educt mixture comprising a ketone and a dialkylaminosulfur trifluoride, letting flow the educt mixture into a reaction chamber of defined length, diameter and volume, with a flow path having a width perpendicular to the direction of the flow in the range of 1-10 mm, at a temperature of at least 75° C. up to 120° C., preferably between 80 and 100° C., to perform the deoxofluorination reaction and obtaining a product mixture to quench the product mixture with a basic aqueous solution in a cooled reservoir vessel.