Highly fluorescent and stable 3‐aryl‐6‐methoxy‐2‐oxoquinoline‐4‐carbonitriles 6 (λexc = 408 nm and λem = 510 nm) were synthesized starting from appropriate arylmalonates 2. Ring closure reaction with p‐anisidine gave 4‐hydroxyquinolones 3, which could be bis‐chlorinated to yield quinolines 4. Regioselective hydrolysis produced reactive 4‐chloroquinolones 5, which were converted to green fluorescent 4‐cyano quinolones 6 using toluenesulfinates as catalysts.

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4‐Chlorocarbostyrils 3, 12, 17, 24, 26 with methoxy substituents in 6, 7, or 6,7‐position react with potassium cyanide in a p‐toluenesulfinate mediated reaction either to the highly fluorescent and stable 2‐oxoquinoline‐3,4‐dicarbonitriles 6, 27, 29, 30 or at slightly lower temperatures to 4‐monocarbonitriles 5, 13, 18. 4‐Chlorocarbostyril 3 and lithium p‐toluenesulfinate gave pure 4‐toluenesulfonylquinolone 4, which reacted with potassium cyanide either to monocarbonitrile 5 or dicarbonitrile 6, depending on the reaction conditions. 4‐Trifluoromethylquinolones 9 and 19 were prepared for fluorescence comparison from the appropriate methoxyaniline and 4,4,4‐trifluoroacetoacetate. The fluorescence properties such as emission wavelengths and quantum yields of 6‐methoxyderivatives 4, 5, 6, 9, 13 were studied and compared with those of 7‐methoxy derivatives 18, 19 and 6,7‐dimethoxyderivatives 27, 28, 29, 30. 6,7‐Dimethoxy derivatives show best results, showing long‐waved fluorescence spectra up to 520 nm and acceptable quantum yields up to 0.46 for 3,4‐dicyano derivative 27 excited at 440 nm in acetonitrile.

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The present study was conducted with the aim of extracting and characterising Cucurbita pepo seed oil and then producing soap with important dermatological properties. The physico-chemical results of the Cucurbita pepo seed oil after extraction were satisfactory and indicate that the oil obtained contains long-carbonaceous fatty acids. The production of the soap was based on the realisation of a saponification reaction by reflux heating between the extracted oil and a solution of soduim hydroxyde 7M for one hour. The soap obtained is characterised by the following physico-chemical parameters: salt content, alkali content, pH, and humidity; which meet ISO 684-1974 standards. The antibacterial parameters of the soaps S1, S2, S3, S4, S5 and S6 were determined by the Agar Diffusion test using the well method and these soaps showed an interesting antibacterial activity against the germs pseudomonas aeruginosa and staphylococcus aureus. Soaps based on Raffia sese oil (kolo oil) and Elaesis guineensis oil (palm oil) have also been synthesized for comparison with soap obtained from Cucurbita pepo seed oil.