摘要:
Electron-deficient porphyrins are provided, as well as processes and intermediates for their preparation. In preferred embodiments, the electron-deficient porphyrins are prepared by condensing pyrrole derivatives and removing water thus formed from the resulting reaction mixture.
摘要:
Direct oxidation of propylene to propylene oxide is accomplished using alkaline earth metal compound-supported silver catalysts containing an inorganic chloride promoter and a potassium promoter derived from a potassium salt containing a nitrogen oxyanion or precursor thereof.
摘要:
This invention is a process for the selective preparation of fluorinated hydrocarbons from chlorinated hydrocarbons while minimizing formation of oligomeric and polymeric byproducts. The process comprises providing a liquid phase containing chlorinated hydrocarbon, HF, a tin catalyst, and at least one compound selected from the group consisting of metal and nonmetal alkoxides, and heating the mixture and isolating the fluorinated hydrocarbon formed.
摘要:
In a process for the liquid phase carbonylation of an alkyl alcohol such as methanol, and/or a reactive derivative thereof to produce the corresponding carboxylic acid and/or ester, in the presence of an iridium catalyst, an alkyl halide and water, the reaction is promoted by the presence of at least one promoter selected from cadmium, mercury, zinc, gallium, indium and tungsten, optionally with a co-promoter selected from ruthenium, osmium and rhenium.
摘要:
Novel .beta.-aminovinyl ketones of the general formula ##STR1## wherein R.sup.1 is, in particular, an alkenyl, alkynyl, cycloalkyl or cycloalkenyl group; R.sup.2 is, in particular, an electron-attracting substituent such as nitro, acyl, ester, alkylthio, carbamoyl, thiocarbamoyl or haloalkyl; R.sup.3 is, in particular, an alkyl or alkoxy group or a halogen atom; n is 1 or 2 and m is 0, 1, 2 or 3. A method for preparing such compounds by carrying out a condensation reaction between ketone R.sup.1 --CO--CH.sub.3 and, in particular, benzonitrile substituted by (R.sup.2).sub.n and optionally (R.sup.3).sub.m, in the presence of a strong base, as well as a process employing said .beta.-aminovinyl ketones of general formula (VI) for preparing the corresponding .beta.-diketones, are also disclosed.
摘要:
Electron-deficient porphyrins are provided, as well as processes and intermediates for their preparation. In preferred embodiments, the electron-deficient porphyrins are prepared by condensing pyrrole derivatives and removing water thus formed from the resulting reaction mixture.
摘要:
Esters of acrylic and methacrylic acid with alcohols and polyols having levels of purity greater than about 95% as measured by gas chromatography using an 11 meter RT.times.200 trifluoropropylmethyl polysiloxane column, a flame ionization detector, an injection temperature of 200.degree. C., an initial column temperature of 90.degree. C. for two minutes, followed by heating to 270.degree. C. at a rate of 8.degree. C. per minute and a detector temperature of 300.degree. C.
摘要:
Catalytic composition comprising copper chloride, magnesium chloride and caesium chloride deposited on an alumina, which may be used in particular for the oxychlorination of ethylene into 1,2-dichloroethane. In the processes for the oxychlorination of ethylene in oxygen in a fluid bed, this catalytic composition makes it possible to obtain an excellent yield of 1,2-dichloroethane without causing the deposition of soiling material on the surface of the bundle of tubes of the heat exchanger located in the reactor.
摘要:
There is disclosed a method for the preparation of difluoromethane wherein methylene chloride is reacted with. hydrogen fluoride in liquid phase, at a temperature of about 70.degree. to 90.degree. C. under a pressure of about 11 to 12 kg/cm.sup.2.g in the presence of antimony pentachloride. It is important that the concentration of quinquevalent antimony is maintained at a level of 85% or more with the feed mole ratio of hydrogen fluoride to methylene chloride ranging from about 2.0 to 2.3.Applicable to industrial scale, the method is operated in a batch system or in a continuous system. In addition, it exhibits superior conversion rate of the materials and production yield.
摘要翻译:公开了二氯甲烷与二氯甲烷反应制备二氟甲烷的方法。 氟化氢在液相中,在约70至90℃的温度下,在约11至12kg / cm 2的压力下,在五氯化锑存在下。 重要的是,将氟化氢与二氯甲烷的进料摩尔比在约2.0至2.3范围内,将五价锑的浓度保持在85%或更高的水平。 适用于工业规模,该方法以批量系统或连续系统运行。 此外,它表现出优异的材料转化率和产量。
摘要:
A compound of the formula ##STR1## wherein R is selected from the group consisting of hydrogen, acyl of an organic carboxylic acid of 1 to 8 carbon atoms, allyloxycarbonyl, alkoxycarbonyl and aralkoxycarbonyl of up to 8 carbon atoms and alkylsulfonyl and arylsulfonyl of up to 8 carbon atoms and their use to prepare substituted 16,17-methylenedioxy-steroids and novel intermediates.