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Priority to RO111899ApriorityCriticalpatent/RO87064B1/ro
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Organic Low-Molecular-Weight Compounds And Preparation Thereof
(AREA)
Abstract
Inventia se refera la un procedeu de obtinere a 4-hidroxicumarinei prin ciclizarea malonatului de difenil cu clorura de aluminiu, care se realizeaza în raport molar malonat de difenil: AlCl3 1: 2,25, cu regim de reactie 2h la 140...150 degree C cu izolarea produsului prin descompunerea masei de reactie cu HCl, dizolvarea în solutie alcalina si precipitare fractionata cu HCl la pH 5...5,5 si apoi pH de 1...2.
RO111899A1983-08-161983-08-16Procedeu de obtinere a 4-hidroxicumarinei
RO87064B1
(ro)