Process for Pd-catalyzed hydroxycarbonylation of diisobutene: ligand/Pd ratio.

Process for the direct conversion of alkenes to carboxylic acids.

Process for Pd-catalyzed hydroxycarbonylation of diisobutene:sulfuric acid/ligand ratio.

Process for Pd-catalyzed hydroxycarbonylation of diisobutene:acetic acid/diisobutene ratio.

Process for Pd-catalyzed hydroxycarbonylation of diisobutene: Effect of solvent

Provided is a method for producing an aromatic compound, which can produce a particular aromatic compound at high yield and can be industrially utilized. According to the invention, there is provided a method for producing an aromatic compound, including an aromatization reaction which includes reacting an oxime compound represented by Formula (1) with an acylating agent in the presence of a hydroquinone compound and a palladium compound, and thus obtaining an aromatic compound. ##STR00001##

Provided are an imidazo[1,2-a]pyridine-3-carboxylate derivative and a preparation method thereof, and more particularly, a method of effectively preparing an imidazo[1,2-a]pyridine-3-carboxylate derivative by performing an aza-[3+2] cycloaddition reaction of a pyridine derivative with an -diazo oxime ether derivative in the presence of a copper (II) catalyst, and an imidazo[1,2-a]pyridine-3-carboxylate derivative prepared thereby.

Diphosphites with a dicyclohexylphosphino radical and use thereof in hydroformylation.

A polyvinyl alcohol is produced in a method comprising: a polymerization step comprising polymerizing vinyl ester monomers by controlled radical polymerization in the presence of a radical initiator and an organic cobalt complex to obtain a polymer solution containing a polyvinyl ester; an extraction step comprising extracting a cobalt complex from the polymer solution by contacting an aqueous solution containing a water-soluble ligand with the polymer solution; and a saponification step comprising saponifying the polyvinyl ester after the extraction step to obtain a polyvinyl alcohol. A method for producing a polyvinyl alcohol is thus provided that has a narrow molecular weight distribution and a high number-average molecular weight with good hue and further good solubility in water.

Processes for producing an ,-unsaturated carboxylic acid, such as acrylic acid, or a salt thereof, using treated solid oxides are disclosed. The treated solid oxides can be calcined solid oxides, metal-treated solid oxides, or metal-treated chemically-modified solid oxides, illustrative examples of which can include sodium-treated alumina, calcium-treated alumina, zinc-treated alumina, sodium-treated sulfated alumina, sodium-treated fluorided silica-coated alumina, and similar materials.