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3 results about "Pyrazolone derivatives" patented technology
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Pyrazolone can exist in 3 isomers: 3-pyrazolone, 4-pyrazolone, and 5-pyrazolone. These isomers can interconvert via lactam–lactim and imine–enamine tautomerism; these conversion often display photochromism. For pyrazolone derivatives, the 5-pyrazolone form can be stabilized with N-alkyl or N-aryl substituents.
A 4-benzylidene pyrazolone derivative and its synthesis method
ActiveCN116655537BOrganic chemistryBulk chemical productionOrganic synthesisPharmaceutical Substances
The present invention discloses a 4-benzylidene pyrazolone derivative and a synthesis method thereof, belonging to the technical field of organic synthesis. The 4-benzylidene pyrazolone derivative is obtained by reacting an α-ketoester with a 1,2-diaza-1,3-butadiene compound under the promotion of a phosphorus reagent; the raw materials used in the present invention are simple and easily available, and have good stability; the reaction conditions are mild, and the types of substituents on the synthesized 4-benzylidene pyrazolone product are rich and can be flexibly changed; the 4-benzylidene pyrazolone derivative provided by the present invention has rich drug activities, and provides candidate compounds for the design, synthesis and development of novel drug molecules containing a 4-benzylidene pyrazolone structure.
Owner:TAIYUAN UNIVERSITY OF TECHNOLOGY
Colorant composition for dyeing keratin fibres and kit comprising same
A colorant composition for dyeing keratin fibers and a kit comprising the composition are disclosed. A colorant composition comprising i) at least one oxidation dye selected from pyrazolone derivatives; ii) at least one sulfur-containing reducing agent; iii) at least one perfume essential oil free of reactive carbonyl groups; and iv) at least one antioxidant. A non-therapeutic method for dyeing keratin fibres is also disclosed.
Owner:LOREAL SA
Composition of dye for dyeing keratin fibers and necessary components including the same
DYE COMPOSITION FOR DYEING KERATIN FIBERS AND A KIT INCLUDING THEREOF. The present invention relates to a dye composition for dyeing keratin fibers and a kit comprising the dye composition. The dye composition comprises i) at least one oxidative dye selected from pyrazolone derivatives; ii) at least one sulfur-containing reducing agent; iii) at least one aromatic essential oil without a reactive carbonyl group; and iv) at least one antioxidant. The present invention also relates to a non-therapeutic process for dyeing keratin fibers. Figure for abstract: none
Owner:LOREAL SA