Showa Denko K.k.

Showa Denko Kabushiki Kaisha

Yoshimasa Ishimura

Yuseki Suyama

Hiroyuki Monzen

Kuniomi Marumo

Taketoshi Naito

Kouhei Morikawa

Motoo Miura

Tsutomu Nozawa

Shuuji Hirayama

Nobuyuki Nagato

Hideo Takahashi

Yutaka Ohnishi

Yohei Kurata

Naoaki Misu

Nobutake Mihara

Kazuhiko Hiromoto

Shuji Hirayama

Nobuyuki Kondo

Haruki Ishigami

Takami Oe

Noble metal, particularly ruthenium, Raney catalysts which can hydrogenate (1) aromaticity-exhibiting ring portions of organic compounds, (2) carboxylic acids and their ester portions (carbonyl ester groups), (3) ring portions and carboxylic acid or their ester groups in compounds having such ring portions and carboxylic acid or their ester portions, and (4) ring portions and nitrile groups of aromatic nitrile compounds and methods for the preparation of corresponding hydrogenated compounds. The methods allow preparation of hydrogenated compounds having hydrogenated aromatic ring portions, hydrogenated carbonyl ester groups, hydrogenated aromatic ring and carbonyl ester groups, or hydrogenated aromatic rings and nitrile groups under milder hydrogen pressure and temperature conditions than the conventional catalysts.

Metal raney catalysts and preparation of hydrogenated compounds therewith

Noble metal raney catalysts and preparation of hydrogenated compounds therewith

Noble metal, particularly ruthenium, Raney catalysts having the property of catalyzing the hydrogenation of (1) aromaticity-exhibiting ring portions of organic compounds, (2) carboxylic acids and their ester portions (carbonyl ester groups), (3) ring portions and carboxylic acid or their ester groups in compounds having such ring portions and carboxylic acid or their ester portions, and (4) ring portions and nitrile groups of aromatic nitrile compounds and methods for the preparation of corresponding hydrogenated compounds. The methods allow preparation of hydrogenated compounds having hydrogenated aromatic ring portions, hydrogenated carbonyl ester groups, hydrogenated aromatic ring and carbonyl ester groups, or hydrogenated aromatic rings and nitrile groups under milder hydrogen pressure and temperature conditions than the conventional catalysts.

Noble metal Raney catalysts and preparation of hydrogenated compounds

Process for producing hydrogen peroxide

A benzopyran derivative represented by formula (I): ##STR1## wherein R.sub.0 represents an alkyl or alkenyl group having 10 to 20 carbon atoms, R.sub.1 to R.sub.3 each represent a methyl group or a hydrogen atom, and G represents a --CH.sub.2 CH(OH)CH.sub.2 OH or --CH(CH.sub.2 OH).sub.2 group; or a salt thereof, which has a high water-solubility and thus is usable in cosmetics.

Benzopyran derivative, method for producing the same and use thereof

A method for producing L-ascorbic acid 2-phosphates, is disclosed which comprises phosphorylating L-ascorbic acid whose hydroxyl groups at the 5- and 6-positions are unprotected or protected with a protective group, or salts thereof, with a phosphorus oxyhalide to form corresponding L-ascorbic acid 2-phosphates, wherein a reaction mixture obtained after the phosphorylation reaction is heated to convert by-products derived from L-ascorbic acid into L-ascorbic acid, which again is subjected to the phosphorylation reaction with the phosphorus oxyhalide. The method produce L-ascorbic acid 2-phosphates in a high yield and at a high purity with simple operations.

Method for producing L-ascorbic acid 2-phosphates

A process for the preparation of an aminopropylalkoxysilane, which comprises reacting a hydrosilane compound with an allylamine compound in the presence of at least one member selected from the group consisting of phosphorus compounds having a phosphorus-nitrogen bond, which are represented by the following formulae: ##STR1## wherein Z.sup.1, Z.sup.2, Z.sup.3, Z.sup.4, Z.sup.5 and Z.sup.6 independently represent a hydrogen atom, an aliphatic hydrocarbon group having 1 to 8 carbon atoms, an alicyclic hydrocarbon group having 5 to 8 carbon atoms or an aromatic hydrocarbon group, and a rhodium compound. According to this process, the aminopropylalkoxysilane can be prepared in a high yield at a low cost and a high efficiency, while controlling the formation of the .beta.-compound to a very low level.

Process for preparation of aminopropylalkoxysilane

An allyl type amine is prepared by reacting an allyl type alcohol represented by the following formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 independently stand for a hydrogen atom, an aliphatic hydrocarbon group or alicyclic hydrocarbon having 1 to 8 carbon atoms, or an aromatic hydrocarbon group, with at least one member selected from the group consisting of ammonia, a primary amine and a secondary amine in the presence of a palladium compound and a multidentate phosphorus compound.

Process for preparation of allyl type amine

Growing community of inventors

Kawasaki, Japan

Yoshimasa Ishimura