摘要:
The invention relates to a process for the synthesis of a compound having the following formula (I), or a salt thereof, in which formula (I) R is a COOH, CH 2 OH or CHO group, comprising the step according to which but-3-ene-1,2-diol (BDO) is subjected to oxidation in the presence of a catalyst, said catalyst comprising an active phase based on at least one noble metal chosen from palladium, gold, silver, platinum, rhodium, osmium, ruthenium and iridium, and a support containing basic sites. The invention also relates to the application of this reaction to the preparation of bioavailable methionine compounds, in particular used in animal feed.
摘要:
Supported noble metal-comprising catalysts which can be obtained by a1) application of a noble metal compound, optionally in admixture with additives acting as promoters, to a support material, then drying, and a2) application of a reducing agent to a support material, then drying, wherein steps a1) and a2) are repeated simultaneously or in alternating turns, or wherein either of the compounds is applied entirely and then the other one is applied entirely, b) optionally afterwards drying of the resulting product, and c) subsequent calcination, its use, especially for oxidative dehydrogenation and a process for producing it.
摘要:
A process by which an α-oxocarbonyl compound useful as an intermediate for medicines/agricultural chemicals can be industrially advantageously and efficiently produced in a high yield. The process, which is for producing an α-oxocarbonyl compound represented by the following general formula (I): (wherein R1 and R2 are the same as defined in the description), is characterized by oxidizing an α-hydroxycarbonyl compound represented by the following general formula (II): with oxygen or the surrounding air in the presence of a carboxylic acid and at least one vanadium compound selected among divanadium pentaoxide, divanadium trioxide, divanadium tetraoxide, ammonium metavanadate, sodium metavanadate, potassium metavanadate, triethoxyoxyvanadium, tripropoxyoxyvanadium, triisopropoxyoxyvanadium, vanadium oxydiacetylacetonate, and vanadium triacetylacetonate.
摘要:
The invention relates to a method for producing aldehydes and ketones from easily accessible primary and secondary alcohols by oxidation with atmospheric oxygen or pure oxygen using a catalyst system which consists of a derivative of a free nitroxyl radical.
摘要:
A process by which an α-oxocarbonyl compound useful as an intermediate for pharmaceuticals/agricultural chemicals can be industrially advantageously and efficiently produced in a high yield. The process, which is for producing an α-oxocarbonyl compound represented by the general formula (I)
wherein R 1 and R 2 are as defined in the description, comprises oxidizing an α-hydroxycarbonyl compound represented by the general formula (II)
, with oxygen or air in the presence of a carboxylic acid and at least one vanadium compound selected from divanadium pentaoxide, divanadium trioxide, divanadium tetraoxide, ammonium metavanadate, sodium metavanadate, potassium metavanadate, triethoxyoxovanadium, tripropoxyoxovanadium, triisopropoxyoxovanadium, vanadium oxobis(acetylacetonate) and vanadium tris(acetylacetonate).
摘要:
Nanohybrid sol-gel materials, based on silica (ormosil) and doped with the ruthenium species tetra-n-propylammonium perruthenate (TPAP) are highly efficient catalysts for the selective oxidation of alcohols to carbonyls with oxygen at low pressure, in organic solvents as well as in carbon dioxide in supercritical state are decribed. Optimal conditions for the preparation and use thereof in liquid-phase as well as in supercritical CO2 were set by studying the structure-activity relationships of the materials, with particular reference to the surface hydrophobic/hydrophilic properties and to the textural ones.
摘要:
A ruthenium-carrying alumina, which is prepared by suspending alumina in a solution containing trivalent ruthenium and adding a base to the suspension, is provided. This ruthenium-carrying alumina is useful as a catalyst for oxidizing alcohols by contacting the alcohols with molecular oxygen, and can be used for oxidizing the alcohols at a high conversion to produce ketones, aldehydes, carboxylic acids, etc. with good productivity.