摘要:
5-Ethylidene-2-norbornene with high quality is effectively prepared by isomerization 5-vinyl-2-norbornene containing 1 ppm to 0.5% by weight of 4-vinylcyclohexene in the presence of at least one catalyst selected from the group consisting of a solid base catalyst which is prepared by reacting alumina, an alkali metal hydroxide and an alkali metal in a temperature range of 200.degree. to 500.degree. C. and a solid base catalyst which is prepared by reacting water-containing alumina and an alkali metal in such an amount that exceeds a molar equivalent of water contained in alumina at a temperature in a range between a melting point of the alkali metal and 500.degree. C. in an inert gas atmosphere.
摘要:
An alkyl-substituted hydrocarbon is prepared by alkylating an aromatic hydrocarbon having at least one hydrogen atom at an alpha-position in a side chain with an olefin in the presence of a solid base which is obtainable by heating an alumina, an alkali metal hydroxide and an alkali metal or an alumina containing at least 1.3% by weight of water and an alkali metal in an inert gas atmosphere at a specific temperature as a catalyst.
摘要:
An alkyl-substituted hydrocarbon is prepared by alkylating an aromatic hydrocarbon having at least one hydrogen atom at an alpha-position in a side chain with an olefin in the presence of a solid base which is obtainable by heating an alumina, an alkali metal hydroxide and an alkali metal or an alumina containing at least 1.3% by weight of water and an alkali metal in an inert gas atmosphere at a specific temperature as a catalyst.
摘要:
In a Reimer-Tiemann reaction for the preparation of a mixture of two hydroxybenzaldehydes (i.e., salicylaldehyde and p-hydroxybenzaldehyde) by reacting phenol with chloroform and an aqueous alkali solution in a heterogeneous system, the two hydroxybenzaldehydes can be prepared in a controlled formation ratio, yield and reaction rate depending upon the conditions used when the reaction is carried out in the presence of a phase transfer catalyst selected from the group consisting of a cationic type phase transfer catalyst, an amphoteric type phase transfer catalyst and an anionic type phase transfer catalyst.
摘要:
Trans-2,2-dimethyl-3-(2,2-dihalovinyl)-cyclopropane carboxylic acid halides which are an intermediate for insecticides are prepared by allowing arylphosphines to react with cis- or cis-/trans-mixed 2,2-dimethyl-3-(2,2-dihalovinyl)-cyclopropane carboxylic acid halides of the formula ##STR1## wherein both X and Y are halogen atoms, respectively, at a temperature of -10.degree. to 100.degree. C., in the presence of absence of halogen compounds.
摘要:
A solid base which is obtainable by reacting alumina with an alkali metal hydroxide and an alkali metal hydride or reacting water-containing alumina with an alkali metal hydride in an amount more than the molar equivalent of water container in the water-containing alumina, at a temperature of 200.degree. to 500.degree. C. in an inert gas atmosphere can effectively catalyze various reactions, particularly isomerization of olefins.
摘要:
A solid base obtainable by heating and reacting an alkaline earth metal compound with alumina at a temperature of from 300.degree. to 600.degree. C. and then heating and reacting the reaction product with at least one material selected from the group consisting of alkali metals and hydrides of alkali metals in an inert gas atmosphere at a temperature of from 200.degree. to 450.degree. C., which can catalyze various reaction, for example, isomerization of an olefinic double bond.
摘要:
An alkyl-substituted hydrocarbon is prepared by alkylating an alkyl aromatic hydrocarbon having at least one hydrogen atom at an alpha-position in a side chain with an olefin in the presence of a solid base which is obtainable by heating an alumina, an alkali metal hydroxide and an alkali metal hydride or an alumina containing at least 1.3% by weight of water and an alkali metal hydride in an inert gas atmosphere at a temperature of 200.degree. to 800.degree. C. as a catalyst.
摘要:
Racemic dihalovinylcyclopropane carboxylic acid halides, which are intermediates of such insecticides as permethrin, cypermethrin etc., are prepared by allowing phosphorus iodides, silicon iodides or boron iodides to react with optically active dihalovinylcyclopropane carboxylic acid halides of the formula: ##STR1## wherein X and Y stand for halogen atoms and the mark * indicates an asymmetric carbon atom.
摘要:
A process for isomerizing an olefin to an internal olefin in the presence of a solid base which is obtainable by heating an alkali metal hydride and alumina, wherein the alumina has been pretreated with at least one salt selected from the group consisting of alkali metal carbonates and alkali metal aluminates, in an atmosphere of an inert gas at a temperature of 200 to 450.degree. C.