摘要:
A process is disclosed for the preparation of 2-alkyl-1,4-butanedial by hydroformylation of acetals of a 2-alkyl-substituted-1-propenal in the presence of a complex rhodium catalyst. The 3-alkyl-4,4-dialkoxybutanal obtained in this manner is separated and hydrolyzed to the desired compound.
摘要:
A process for the production of 1,12-dodecanoic diacid by hydroformylating an olefin in the presence of a rhodium catalyst and oxidation with oxygen of the aldehyde which is thus formed wherein 1,9-decadiene is hydroformylated in the presence of hydridotris-triphenylphosphine-rhodium-carbonyl combined with triphenylphospine and/or triphenylphosphite, and the 1,12-dodecanedialdehyde which was thus formed is oxidized with oxygen in the presence of inorganic or organic Co(II) salts.
摘要:
A process for the production of 1,12-dodecanoic diacid by hydroformylating an unsaturated carboxy compound in the presence of a rhodium catalyst and oxidation of the aldehyde with oxygen, wherein undecyl-10-ene-acid is hydroformylated in the presence of hydridotristriphenylphosphine-rhodium-carbonyl combined with triphenylphosphine and/or triphenylphosphite, and the 11-formyl undecanioc acid which is thus formed is oxidized with oxygen in the presence of inorganic and organic Co(II) salts.
摘要:
The preparation of 1,4-butandial (succindialdehyde) is obtained using acrolein. The acrolein is first converted with an alkanol into 3,3-dialkoxy-1-propene and this is then hydroformylated in the presence of hydridotristriphenylphosphine-rhodiumcarbonyl mixed with triphenylphosphine or triphenylphosphite as the catalyst. The thereby obtained 4,4-dialkoxy-butanal is removed from the hydroformylation product by means of distillation and is then hydrolyzed to 1,4-butandial.
摘要:
4-chloro-butanals of the formula ##STR1## where R is hydrogen or a straight or branched chain alkyl group of 1 to 4 carbon atoms are produced by reacting the corresponding 1,1-dimethoxy-4-hydroxybutane at a temperature between -20.degree. and +80.degree. C. in the presence of triphenylphosphine with carbon tetrachloride and hydrolyzing the 1,1-dimethoxy-4-chloro-butane obtained in acid medium.
摘要:
The invention provides a software component plugin framework. The system described supports dynamic loading, instantiation, and unloading of interface implementations (plugin modules), together with encapsulation of these interface implementations. The many benefits provided by the invention include software reuse, interoperability and fast product development cycles.
摘要:
The invention provides a software component plugin framework. The system described supports dynamic loading, instantiation, and unloading of interface implementations (plugin modules), together with encapsulation of these interface implementations. The many benefits provided by the invention include software reuse, interoperability and fast product development cycles.
摘要:
The invention provides a software component plugin framework. The system described supports dynamic loading, instantiation, and unloading of interface implementations (plugin modules), together with encapsulation of these interface implementations. The many benefits provided by the invention include software reuse, interoperability and fast product development cycles.
摘要:
There is disclosed a process for the production of 1-methylcyclopropanecarboxaldehyde of the formula ##STR1## comprising treating 4-chloro-2-methyl-butanal of the formula ##STR2## at a temperature between -40.degree. and +7.degree. C. in an inert solvent with a 1.0 to 10.0 fold molar amount of a strong, non-nucleophilic base.
摘要:
A process is described for producing 2,5-dimethoxytetrahydrofuran and 2,5-diethoxytetrahydrofuran by treating 4,4-dimethoxy-1-butanal and 4,4-diethoxy-1-butanal with a strongly acidic ion exchange resin at a temperature of between 0.degree. and 70.degree. C.