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Takeda GmbH
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Byk Gulden Lomberg Chemische Fabrik GmbH
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Low-Molecular Organic Synthesis Reactions Using Catalysts
(AREA)
Abstract
Process for the preparation of dioxopyrazolidine of the general formula wherein r1 represents an aryl radical or optionally an aryl radical substituted by halogen or alkoxy or alkyl groups r <sub > 2 alkyl radical or an aryl radical optionally substituted by halogenalkoxy groups or alkylr3 an alkylcycloalkylaralkyl radical or aryl which may also be substituted by ethereal radicals acetal groups and/or aminoterciary groups characterized because monoacylarylhydrazines of the general formula ** in which r1 r2 and r3 have the meaning indicated above do reacting with esters of the carboxylic acid or with half halides of said esters or carbon oxyhalides in the presence of alkaline condensation media and preferably in the presence of solvents which behave indifferently in the reaction and at elevated temperature. (Machine-translation by Google Translate, not legally binding)
ES0227061A1955-03-051956-03-02A procedure for obtaining dioxopyrazolidines. (Machine-translation by Google Translate, not legally binding)
ExpiredES227061A1
(en)
Procedure for the preparation of new compounds of 1,4-benzodioxane and 1,5-benzodioxepane (Machine-translation by Google Translate, not legally binding)
A procedure for the preparation of derivatives of the dialcoil-ditiofosforic acids with amidic function. (Machine-translation by Google Translate, not legally binding)
Procedure for the obtaining of new arilalkilcarboxylic acids, its basic esters, acid salts and quaternary salts (Machine-translation by Google Translate, not legally binding)