摘要:
Compounds are used as catalysts according to general formula (1) M+x(C(SO2CF3)3)x whereby x is equal to 1 or 2; M represents one hydrogen or alkaline metal atom when x equals 1; and M represents one alkaline-earth metal atom when x equals 2. The invention also relates to a novel Mg compound of formula (1).
摘要:
The present invention relates to a method for organic reactions. More specifically, a method for palladium, except Pd/C, catalyzed organic reactions comprising a heating step with microwave energy. One type of organic reactions concerned are coupling reactions, in which new carbon-carbon bonds are formed. Preferred reactions are the Heck, Stille and Suzuki reactions. The method provides high yields in very short reaction times.
摘要:
The present invention provides compounds having the formula: in which R is hydrogen or C 1 -C 4 alkyl, preferably hydrogen and Y is hydrogen, C 1 -C 4 alkyl, C 1 -C 4 alkoxy, CF 3 , halogen (F, Cl, Br or I) or SO 3 M in which M is H, Na, K, Ca, Mg, ammonium, mono-, di-, tri- or tetra-C 1 -C 4 alkylammonium, mono-, di- or tri-hydroxyalkylammonium or ammonium that is di- or tri-substituted with a mixture of C 1 -C 4 alkyl and C 1 -C 4 hydroxyalkyl groups; a process for their production by partial dehydration of compounds having the formula: ; and their use as intermediates in the production of asymmetric or symmetric fluorescent whitening agents.
摘要:
The invention relates to a process for producing 3-aryl propines in which alkines are reacted with benzyl halides in the presence of a palladium compound and weak bases, and to some novel 3-aryl propines.
摘要:
Novel compound 1,2-di(isobutylphenyl)ethane and method for preparing 4-isobutylstyrene and a-(4-isobutylphenyl)propionic acid from this compound. In the preparation of 4-isobutylstyrene from the former compound by cracking or disproportionation, the components in the resultant reaction mixture can be separated without difficulty, the formation of by-product isobutylbenzene can be avoided, and the remaining unreacted starting material can be reused for the same reaction without causing any adverse effect on the catalyst.
摘要:
The electrical insulating characteristics of a hydrocarbon fraction which is obtained by reacting an aromatic hydrocarbon or hydrocarbons with an alkylating agent in the presence of alkylating catalyst to produce an alkylation product mainly consisting of mono- and polyalkylated aromatic hydrocarbons, diarylalkanes, heavier products and unreacted substances, then separating unreacted substances and mono- and polyalkylated aromatic hydrocarbons to obtain a separated fraction, and if required, refining said separated fraction, are improved by a process which comprises dehydrogenating said fraction at a temperature in the range of 350 to 650°C in the presence of a dehydrogenation catalyst to obtain a dehydrogenated reaction mixture containing at least 0.5 % by weight of an aromatic monoolefin or diolofin having two condensed or non-condensed aromatic nuclei.
摘要:
A method for producing alkylstyrene which is characterized in that 1,2-di(substituted phenyl)ethane is brought into contact with an acid catalyst at 200°C to 650°C in the presence of an inert gas to crack it into alkylstyrene and alkylbenzene. The method of the invention has advantages in that the operation of reaction and separation of reaction mixture are quite easy, the lowering of catalytic activity is small, and unreacted starting material can be reused.