Asahi Kasei Kogyo Kabushiki Kaisha

Asahi Kasei Kabushiki Kaisha

Setsuo Yamamatsu

Tatsuo Yamaguchi

Yoshio Suzuki

Nobuhisa Miyake

Atsushi Aoshima

Yohei Fukuoka

Nobuhiro Tamura

Tamotsu Kodama

Haruyuki Minoura

Joji Nishikido

Tsutomu Katsumata

Shoichiro Tonomura

Tadayuki Ibuki

Hiroshige Okamoto

Ryoichi Mitsui

Koshiro Yokota

Naoko Ishihara

A method for acylating a hexakis (arylmethyl) hexaazaisowurtzitane (WB,) by reductively removing the arylmethyl groups in the presence of an acylating agent, characterized by contacting a WB,(a) with a heterogeneous system reduction catalyst (b) in the presence of an acylating agent (c) and a reducing agent (d) in a solvent (e) for the WB,(a) to reductively remove the arylmethyl groups from the WB,(a) and acylate the same, and by preventing the WB,(a) and the catalyst (b) from being contacted with each other when at least either of the acylating agent (c) and the reducing agent (d) is not present. In this method, the decomposition of the WB,skeleton, which readily occurs in the beginning of the acylation of the WB,as a starting material, can be highly effectively inhibited. This method can hence stably produce a tetraacylhexaazaisowurtzitane derivative in a high yield and is industrially advantageous.

Method for acylating hexakis (arylmethyl) hexaazaisowurtzitane

A noble metal-supported article which comprises a carrier and a palladium-containing metal component supported on the carrier, which article has (A) a layer in which substantially no palladium is supported in the interior of the carrier and (B) a layer in which palladium is supported in the region from the outer surface to a depth of less than 100 &mgr;m of the carrier.

Noble metal support

Process for the preparation of acylated hexaazaisowurtzitane derivatives

Catalyst for use in producing carboxylic esters

Process for the preparation of methacrylic acid and methacrolein

A process for purifying a polyalkylene ether, which comprises mixing a polyalkylene ether or a mixture of a polyalkylene ether and an organic solvent containing a heteropoly acid and/or its salt with at least one solvent for purification selected from hydrocarbons having 3 to 15 carbon atoms or halogenated hydrocarbons having 1 to 15 carbon atoms and separating by precipitation the phase composed mainly of the heteropoly acid and/or its salt, and a process wherein the polyalkylene ether or a mixture of a polyalkylene ether and an organic solvent containing a heteropoly acid and/or its salt is brought into contact with a solid adsorbent capable of adsorbing the heteropoly acid and/or its salt in the presence of at least one solvent for purification as described above, either further after the separation according to the process described above, or in the state unseparated. According to the present invention, the heteropoly acid and/or its salt dissolved in the polyalkylene ether or the mixture of the polyalkylene ether with the organic solvent can be removed efficiently in the form which can be reused. Further after the treatment with an adsorbent, the concentration of heteropoly acids in the polyalkylene ether can be reduced to extremely lower.

Process for purification of polyether

A method for preparing a carboxylic ester by reacting an aldehyde with an alcohol in the presence of oxygen with a catalyst, characterized in that the catalyst is a solid catalyst comprising palladium and bismuth, which may form an intermetallic compound, and which catalyst may comprise an alkali metal compound or an alkaline earth metal compound. The aforesaid catalyst avoids decomposition reactions simultaneously with the desired reaction, and therefore, the desired compound can be obtained in a high yield.

Method for preparing carboxylic esters

Process for producing carboxylic amides

A carboxylic ester is produced in one step in a high yield and with a high selectivity by reacting an aldehyde with an alcohol in the presence of oxygen by using a catalyst comprising (I) palladium, (II) at least one compound selected from the group consisting of lead compounds, thallium compounds and mercury compounds and (III) at least one compound selected from the group consisting of alkali metal compounds and alkaline earth metal compounds.

Process for producing carboxylic esters

Growing community of inventors

Fuji, Japan

Setsuo Yamamatsu