Catechol

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Catechol, also known as pyrocatechol or 1,2-dihydroxybenzene, is an organic compound essentially used as building block. It is available in two forms: F lakes solid form and Molten liquid form. Catechol offers multiple possibilities of bondings, providing different type of interactions and related properties:. First industrialized in the s by Syensqo Food Experts, ethylvanillin provides a warm and powerful vanilla note. Discover Syensqo best in class technology available for fire safety in textiles and garments: flame retardant protection for lifetime of the garment, strict quality procedures and extremely comfortable for wearers in Industrial and Personal environments. Absolutely no carbon of petrochemical origin is used in its production.

Catechol

It is the ortho isomer of the three isomeric benzenediols. This colorless compound occurs naturally in trace amounts. It was first discovered by destructive distillation of the plant extract catechin. About 20, tonnes of catechol are now synthetically produced annually as a commodity organic chemical, mainly as a precursor to pesticides, flavors, and fragrances. Catechol was first isolated in by Edgar Hugo Emil Reinsch — by distilling it from the solid tannic preparation catechin , which is the residuum of catechu , the boiled or concentrated juice of Mimosa catechu Acacia catechu. This was a thermal decomposition product of the flavanols in catechin. In , both Wackenroder and Zwenger independently rediscovered catechol; in reporting on their findings, Philosophical Magazine coined the name pyrocatechin. Catechol has since been shown to occur in free form naturally in kino and in beechwood tar. Its sulfonic acid has been detected in the urine of horses and humans. Catechol is produced industrially by the hydroxylation of phenol using hydrogen peroxide. It can be produced by reaction of salicylaldehyde with base and hydrogen peroxide Dakin oxidation , [10] as well as the hydrolysis of 2-substituted phenols, especially 2-chlorophenol , with hot aqueous solutions containing alkali metal hydroxides.

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Federal government websites often end in. The site is secure. Preview improvements coming to the PMC website in October Learn More or Try it out now. Hydrogels are a unique class of polymeric materials that possess an interconnected porous network across various length scales from nano- to macroscopic dimensions and exhibit remarkable structure-derived properties, including high surface area, an accommodating matrix, inherent flexibility, controllable mechanical strength, and excellent biocompatibility. Strong and robust adhesion between hydrogels and substrates is highly desirable for their integration into and subsequent performance in biomedical devices and systems. However, the adhesive behavior of hydrogels is severely weakened by the large amount of water that interacts with the adhesive groups reducing the interfacial interactions. The challenges of developing tough hydrogel-solid interfaces and robust bonding in wet conditions are analogous to the adhesion problems solved by marine organisms.

Catechol

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'catechol. Send us feedback about these examples. Accessed 19 Mar.

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Induction of apoptosis by benzene metabolites in HL60 and CD34 human bone marrow progenitor cells. Chen H. A full spectrum of high performance and developmental thermoplastics films for specialized industries made from a variety of engineering and specialty polymers. PubChem CID. All animals were killed at 20 weeks. It is rumored to have been used briefly in Eastman Kodak 's HC developer and is rumored to be a component in Tetenal 's Neofin Blau developer. EC Number. Modification by catechol and resorcinol of upper digestive tract carcinogenesis in rats treated with methyl- n -amylnitrosamine. CAS Number. Production and use Worldwide consumption of catechol in was estimated to be about 20 thousand tonnes.

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For example, using phosphorus trichloride or phosphorus oxychloride gives the cyclic chloro phosphonite or chloro phosphonate , respectively; sulfuryl chloride gives the sulfate ; and phosgene COCl 2 gives the carbonate : [11]. Effects of sodium nitrite and catechol, 3-methoxycatechol, or butylated hydroxyanisole in combination in a rat multiorgan carcinogenesis model. Seidel H. Kawabe M. Inhibition of gap-junctional intercellular communication was also demonstrated in one study. Follow NCBI. Schaeffer D. Effect of 4-week treatment with gastric carcinogens and enhancing agents on proliferation of gastric mucosa cells in rats. Gopalakrishna R. PubChem CID. Lide, D.