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Priority claimed from FR8308292Aexternal-prioritypatent/FR2546179B1/fr
Priority claimed from FR8404453Aexternal-prioritypatent/FR2561662B2/fr
Priority claimed from PCT/FR1984/000133external-prioritypatent/WO1984004539A1/fr
Application filed by Transgene SafiledCriticalTransgene Sa
Publication of DK27385D0publicationCriticalpatent/DK27385D0/da
Publication of DK27385ApublicationCriticalpatent/DK27385A/da
Phosphonium compounds, process for their preparation and process for the preparation of optical brighteners based on asymmetrically substituted stilbenes