Showa Denko K.k.

Kouhei Morikawa

Yuseki Suyama

Motoo Miura

Kuniomi Marumo

Yoshimasa Ishimura

Taketoshi Naito

Hiroyuki Monzen

Tsutomu Nozawa

Shuuji Hirayama

Sumio Soya

Akihiro Ohtsubo

Yohko Kataoka

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

Process for preparing cyano group-containing aromatic methylamines

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

A hydantoin compound of the formula: ##STR1## (wherein R stands for an alkyl group of 8 to 20 carbon atoms) increases the sensitivity of a color developing reaction of a heat-sensitive recording material and enhances the high-speed recording property of the recording material without sacrifice of the whiteness thereof. The heat-sensitive recording material containing the hydantoin compound is novel to the art.

Additive for heat-sensitive recording material, the recording material

A hydantoin compound of the formula: ##STR1## (wherein R stands for an alkyl group of 8 to 20 carbon atoms) increases the sensitivity of a color developing reaction of a heat-sensitive recording material and enhances the high-speed recording property of The recordig matvrial Without sacifice of the whiteness thereof. The heat-sensitive recording material containing the hydantoin compound is novel to the art.

3-substituted hydantoins

Growing community of inventors

Kawasaki, Japan

Kouhei Morikawa