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Novartis AG
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JR Geigy AG
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Priority to ES0229352ApriorityCriticalpatent/ES229352A1/es
Publication of ES229352A1publicationCriticalpatent/ES229352A1/es
Heterocyclic Carbon Compounds Containing A Hetero Ring Having Nitrogen And Oxygen As The Only Ring Hetero Atoms
(AREA)
Abstract
Procedimiento para la preparación de 1 2-diaril-3 5. 5-dioxopirazolidinas substituIdas en posición 4 caracterizado porque se hace reaccionar un derivado funcional apto para reaccionar de un ácido carboxílico de fórmula general R-COOH en la que R-CO- significa el radical de un ácido carboxílico eterocíclico eventualmente substituído eventualmente en presencia de un medio de condensación con un malonilhidrazobenceno de fórmula general **(Ver fórmula)**en la que significan Ar1 y Ar2 radicales fenilo que pueden estar substituídos de modo igual o distinto.
ES0229352A1956-06-091956-06-09UN PROCEDIMIENTO PARA LA PREPARACIoN DE 1,2-DIARIL-3,5-DIOXO-PIRAZOLIDINAS, SUSTITUiDAS EN POSICIoN 4
ExpiredES229352A1
(es)