ES305039A3 - Procedure for the preparation of 2-semicarbazide-acetic acid. (Machine-translation by Google Translate, not legally binding)
- Google Patents
Procedure for the preparation of 2-semicarbazide-acetic acid. (Machine-translation by Google Translate, not legally binding)
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Warner Chilcott Pharmaceuticals Inc
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Norwich Pharmacal Co
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Application filed by Norwich Pharmacal CofiledCriticalNorwich Pharmacal Co
Priority to ES0305039ApriorityCriticalpatent/ES305039A3/en
Publication of ES305039A3publicationCriticalpatent/ES305039A3/en
Organic Low-Molecular-Weight Compounds And Preparation Thereof
(AREA)
Abstract
Process for the preparation of 2-semicarbazidoacetic acid, comprising the gradual addition of an aqueous solution of chloroacetic acid to a solution of sodium hydroxide in at least 50% hydrazine hydrate whose temperature is maintained in the order of about 90 to 100º C until completing the reaction, introducing a heat exchange medium into the reaction mixture to distill the excess hydrazine hydrate therefrom and ensuring a suspension of crystalline material, the addition of a cyanating agent to an aqueous solution of said crystalline material, the addition of acid to the mixer to set its pH in the order of about 3 to 9, the subsequent adjustment of the reaction mixture to its isoelectric point and the subsequent separation of 2-semicarbazidoacetic acid from the reaction mixture. (Machine-translation by Google Translate, not legally binding)
ES0305039A1964-10-171964-10-17Procedure for the preparation of 2-semicarbazide-acetic acid. (Machine-translation by Google Translate, not legally binding)
ExpiredES305039A3
(en)
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