Japan Hydrazine Co., Ltd.

Masuda Chemical Industry Co., Ltd.

Other

Masuda Chemical Industries Co., Ltd.

Shunji Hyoda

Hirotoshi Sawada

Masaharu Kita

Shuichi Nemugaki

Youichi Hasegawa

Takahiro Ueta

Hiroyuki Fujita

Yasuo Oki

Kohki Satoh

Sumio Otsuka

Yoshitaka Miyawaki

Yoichi Hasegawa

Mineo Nakagawa

Fumio Toda

Takafumi Kawada

Koki Sato

Hiroshi Taniguchi

Takashi Ogawa

Atsushi Sugino

Yuhki Kubo

A process for preparing 5,5'-bi-1H-tetrazolediammonium salts (BHT.2NH) maintaining a high yield through oxaldiimidic acid dihydrazide (OAH) from the starting materials which are cheaply available and are easy to handle. The 5,5&#x2032;-bi-1H-tetrazolediammonium salts (BHT.2NH) are prepared by dissolving the oxaldiimidic acid dihydrazide (OAH) obtained by the reaction of hydrated hydrazide with dicyan in an aqueous solution of a weakly acidic compound such as acetic acid, dropwisely adding an aqueous solution of sodium nitrite thereto to form an azide thereof and to effect the cyclization reaction by heating, adding an aqueous solution of sodium hydroxide to the reaction product to convert it into a 5,5&#x2032;-bi-1H-tetrazoledisodium salt (BHT.2Na), reacting it with an aqueous solution of ammonium chloride, and recovering the formed ammonium salt as sparingly soluble crystals.

Process for the preparation of 5,5'-bi-1H-tetrazolediammonium salts using hydrazine hydrate and dicyan as starting materials

A process for the preparation of a highly pure 5,5&prime;-bi-1H-tetrazolediammonium salt comprising adding a small amount of ammonia water to a reaction solution containing a 5,5&prime;-bi-1H-tetrazolediammonium salt synthesized in the presence of a copper catalyst, removing by filtration the blue insoluble components of formed copper.ammonia.5,5&prime;-bi-1H-tetrazole complex to obtain a filtrate of the 5,5&prime;-bi-1H-tetrazoledisodium salt and reacting the filtrate with an aqueous solution of ammonium chloride, and recovering the formed, highly pure ammonium salt as sparingly soluble crystals.

Process for the preparation of highly pure 5,5&prime;-bi-1H-tetrazolediammonium salts

Process for producing alicyclic hydrazine derivatives, tetra-hydropyridazine and hexahydropyridazine

A process for the preparation of a 5,5'-bi-1H-tetrazole diammonium salt by dropwisely adding the aqueous hydrogen peroxide to which a small amount of weakly acidic substance has been added, to a starting aqueous solution containing hydrogen cyanide or sodium cyanide or potassium cyanide, sodium azide and a catalytic amount of copper sulfate preferably at a low temperature to maintain the pH of the reaction solution over a range of from 5 to 6, heating the reaction solution to effect the oxidation and cyclization reaction, reacting the reaction product with ammonium chloride or an aqueous solution thereof, and recovering the formed ammonium salt in the form of sparingly soluble crystals. The desired product is obtained in a high yield and in a high purity from the starting materials which are cheaply available and are easy to handle through a decreased number of steps, i.e., through a one-pot reaction without requiring cumbersome after-treatment.

Process for the preparation of 5,5'-bi-1H-tetrazole salt

A process for the preparation of a 5,5'-bi-1H-tetrazole diammonium salt by using dicyan, sodium azide, ammonium chloride and water as a reaction medium. This process is industrially advantageous since the 5,5'-bi-1H-tetrazole diammonium salt is synthesized and, then, the precipitated crystals thereof are simply isolated by filtration to obtain the 5,5'-bi-1H-tetrazole diammonium salt maintaining an yield which is not lower than 90%. The 5,5'-bi-1H-tetrazole diammonium salt is a gas-generating agent for air bags, which is lowly toxic and is easy to handle.

Method for preparing 5,5'-bi-1H-tetrazole salt

The present invention relates to a process for producing alicyclic hydrazine derivatives, tetrahydropyridazine and hexahydropyridazine which are useful as intermediate starting materials such as medicines and agricultural chemicals. Especially, the present invention provides;

Process for producing cyclic hydrazine derivatives,

An industrially and economically advantageous process for the preparation of a TBH-HX using starting materials which are cheaply available and are easy to handle, maintaining a high yield. A tertiary butyl hydrazine hydrohalogenide is prepared by reacting a hydrazine hydrohalogenide with a methyl tertiary butyl ether in the presence of an acid.

Process for the preparation of tertiary butyl hydrazine hydrohalogenide

A method of producing a choline having a high purity without containing by-products by using a molecule-inclusion complex of the choline as a starting material. A choline inclusion complex without containing by-products is obtained by reacting an aqueous solution of the choline containing, as by-products, those cholines to which are added ethylene oxides with host molecules such as of 1,1'-bis-.beta.-naphthol, and is further reacted with a carbon dioxide gas in order to obtain an aqueous solution of a choline carbonate and/or a choline bicarbonate of a high purity, which is then subjected to the electrolysis using a cation-exchange membrane as a diaphragm, in order to obtain an aqueous solution of the choline of a high purity without containing by-products. The choline that is obtained is a strongly basic compound having a high purity and is very useful as a photoresist-developing solution.

Method of producing choline of a high purity

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Sakaide, Japan

Shunji Hyoda