Wako Pure Chemical Industries, Inc.

Honda Giken Kogyo Kabushiki Kaisha

Kazunori Sakamoto

Daisuke Takano

Tomokazu Kato

Toshihiro Fujinaka

Mitsuo Kuwabara

Fumiyoshi Urano

Motoshige Sumino

Keiji Oono

Tadashi Okada

Shigeaki Imazeki

Michiharu Hasegawa

Teruoki Watanabe

Kazuhito Fukasawa

Naoji Yamamoto

Masahito Hasuike

Yasuo Nakanishi

Giichi Ando

Hideo Yoshikawa

Tetsuaki Aoki

Masanori Kogawa

Keizou Tanoue

An object of the present invention is to provide a process for producing high-purity hydroxytriphenylenes in which not only inexpensive raw materials can be used but also no complicated steps of deprotection such as dealkylation, and reduction and the like are necessary, and which is thereby advantageous in industrial production. Also there is provided a novel crystal of 2,3,6,7,10,11-hexahydroxytriphenylene monohydrate, which has satisfactory thermal stability. The process for producing a compound represented by the general formula (2) is characterized by reacting a compound represented by the general formula (1) in the presence of a metal oxide comprising a metal selected from trivalent iron, pentavalent vanadium and hexavalent molybdenum and of a nonvolatile strong acid: wherein, Rs are each independently a hydrogen atom, a halogen atom, an alkyl group having 1 to 3 carbon atoms or an alkoxy group having 1 to 3 carbon atoms.

Process for producing triphenylene compound and crystal obtained by the process

A metal material comprises a Zn&#x2014;Al&#x2014;Sn based alloy (ZAS alloy) and Cu diffused in the alloy, wherein Cu is diffused into the inside of the alloy to a depth from the surface of 0.5 mm or more, the concentration of Cu decreases from the surface of the ZAS alloy towards the inside thereof, and there is present no specific interface between Cu and the ZAS alloy; and a method for producing the metal material involves applying, to the surface of the ZAS alloy, an agent comprising a solvent and, dispersed therein, a material containing Cu such as a Cu powder and a Cu&#x2014;Mn alloy powder and preferably, dispersed or dissolved therein, a reducing agent capable of reducing an oxide film present on the surface of the ZAS alloy, and heating the ZAS alloy having the agent applied thereon, to thereby diffuse Cu into the alloy.

Metal material and method for production thereof

Sulfonium salt compounds

A process and apparatus for heat treatment of a steel article made of soft steel or the like comprising heating the steel article to a brazing temperature of 1100.degree.-1200.degree. C., then cooling the steel article in a furnace to a temperature of about 570.degree.-720.degree. C., and thereafter rapidly cooling the article. The article is heated to brazing temperature in an oxidation-free atmosphere and is also cooled in an oxidation-free atmosphere. The article can be rapidly cooled by contact with a surface pretreatment solution.

Process and apparatus for heat treatment of steel material such as of

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Kawagoe, Japan

Kazunori Sakamoto