Ube Industries, Inc.

Takato Nakamura

Nobuyuki Kuroda

Hiroshi Shiraishi

Tokuo Matsuzaki

Mitsuo Yamanaka

Toshikazu Hamamoto

Sumio Umemura

Junichi Kugimoto

Yasuo Nakamura

Hirofumi Takemoto

Masayuki Nishio

Fumio Iwata

Joji Funatsu

Tetsuro Shimano

Nagaaki Takamitsu

Yoshihiro Yamauchi

Nobuhiro Ii

Takumi Manabe

Takuji Enomiya

Osamu Yamazaki

Hiroaki Imajima

Tadakazu Sakata

Disclosed is a method for producing a biphenyltetracarboxylic acid ester by oxidative coupling a phthalic acid ester by using a catalyst comprising at least a palladium salt, a copper salt and a &#x3b2;-dicarbonyl compound in the presence of a molecular oxygen, wherein the &#x3b2;-dicarbonyl compound is supplied into a reaction mixture liquid intermittently at an interval of less than 30 minutes, or continuously. This method allows, in particular, the selective and economical production of an asymmetric biphenyltetracarboxylic acid tetraester such as 2,3,3',4&#x2032;-biphenyltetracarboxylic acid tetraester.

Method for producing biphenyltetracarboxylic acid tetraester

In reduction of an epoxy group-containing organic compound, for example, a C -C saturated or unsaturated epoxy cycloaliphatic compound, in the presence of a nickel catalyst, by bringing the compound into contact with hydrogen, the target compound can be produced at a high yield by adding a basic substance (for example, an alkali metal hydroxide, an alkali metal carbonate, an alkali metal alkoxide, and an amine compound having 1 to 3 C -C alkyl groups), to the reduction reaction system, to thereby restrict production of by-products due to a side deoxidation reaction.

Method of reducing epoxidized organic compound with hydrogen

Cyclododecanone and cyclododecanol are produced each in high yield by reacting a epoxycyclododecane compound with hydrogen in the presence of a solid catalyst containing (a) catalytic component including a platinum group metal, (b) a promoter component including a VIII group, IIb group, IIIb group, IVb group, Vb group VIb group or VIIb group element or lanthanoid element or compound of the element, and (c) a carrier supporting the components (a) and (b) thereon.

Method of producing cyclododecanone and cyclododecanol

An epoxycyclododecane compound is produced by a catalytic hydrogenation reaction of 1,2-epoxy-5,9-cyclododecadiene, using a specific platinum-containing catalyst having a long life, under a hydrogen gas pressure of 0.8 to 9 MPa, and with a high yield of the target compound.

Method of producing an epoxycyclododecane compound

Epoxidized C -C cyclohydrocarbon compounds, for example, epoxidized C -C cycloalkanes, cycloalkenes and/or cycloalkadienes are converted to cycloalkanols, cycloalkanones and cycloalkanes by hydrogenating the epoxidized C -C cyclohydrocarbon compounds with hydrogen under a pressure of 0.1 to 5.4 MPa at a temperature of 100 to 280&deg; C. in the presence of a catalyst containing at least one platinum group metal, for example, Pd or Ru.

Method of hydrogenating epoxidized C6&mdash;C12 cyclohydrocarbon compounds

Process for producing a cycloalkanol and cycloalkanone

There is disclosed a 5-mercapto-1,2,3-thiadiazoles composition comprising a 5-mercapto-1,2,3-thiadiazole combined with (A) one or more compounds selected from the group consisting of water, an alcohol, an aromatic hydrocarbon and a halogenated hydrocarbon and (B) a halide of an alkali metal and process for preparing the same. Said composition can remarkably reduce the explosiveness of a 5-mercapto-1,2,3-thiadiazole to make its handling easy and to make it usable for various applications with a sense of security, for example, for manufacturing pharmaceuticals and agricultural chemicals.

5-mercapto-1,2,3-thiadiazoles composition and process for preparing the

A process for preparing protocatechualdehyde or a 3-alkoxy-4-hydroxybenzaldehyde which comprises subjecting catechol or a 2-alkoxyphenol to reaction with glyoxylic acid in a basic aqueous medium in the presence of a catalyst containing one or more compounds selected from aluminium oxide, silicon oxide and hydrated aluminium oxide in an amount of not less than 0.01 g per 1 g of the starting catechol or 2-alkoxyphenol at a temperature of 0.degree. to 50.degree. C., and then oxidizing the thus obtained reaction mixture in a basic medium.

Process for preparing protocatechualdehyde and its derivatives

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Ube, Japan

Takato Nakamura