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NAL EDUCACION A DISTANCIA, University of
Consejo Superior de Investigaciones Cientificas CSIC
Universidad Autonoma de Madrid
Original Assignee
NAL EDUCACION A DISTANCIA, University of
Consejo Superior de Investigaciones Cientificas CSIC
Universidad Autonoma de Madrid
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Application filed by NAL EDUCACION A DISTANCIA, University of, Consejo Superior de Investigaciones Cientificas CSIC, Universidad Autonoma de MadridfiledCriticalNAL EDUCACION A DISTANCIA, University of
Priority to ES9002995ApriorityCriticalpatent/ES2031031A6/en
Publication of ES2031031A6publicationCriticalpatent/ES2031031A6/en
Process for obtaining pyrazolyldihydroxy -1,4-benzenes of general formula I, in which n represents a number from 1 to 4 and R1 is a pyrazolyl radical of general formula II, in which R3, R4 and R5, which may be the same or different, represent a hydrogen atom and/or a radical (alkylaryl, arylalkyl, cycloalkyl, heterocyclo, benzoyl) and R4 represents a halogen atom or a nitro, aryl aliphatic or benzoyl group. These compounds are prepared by reacting the corresponding pyrazole with b- benzoquinone, and have high efficiency as photostabilising additives for organic polymers.
ES9002995A1990-11-231990-11-23Process for obtaining pyrazolyldihydroxy -1,4-benzenes
Expired - LifetimeES2031031A6
(en)