Definition & Betydelse | Engelska ordet FURAN

Definition av FURAN

1. (kemi) furan

Exempel på hur du använder FURAN i en mening

• The name derives from its similarity to the oxygen heterocycle furan, but the furanose ring does not have double bonds.
• Industrially, furan is manufactured by the palladium-catalyzed decarbonylation of furfural, or by the copper-catalyzed oxidation of 1,3-butadiene:.
• A furanolactone is a heterocyclic chemical compound that contains both lactone and furan rings in its chemical structure.
• any substance that has a 1-amino-2-phenylethane structure substituted at the 2' and 5' or 2' and 6' positions of the benzene ring by an alkoxy or haloalkoxy group, or substituted at two adjacent carbon atoms of the benzene ring which results in the formation of a furan, dihydrofuran, pyran, dihydropyran or methylenedioxy group—whether or not further substituted on the benzene ring to any extent, whether or not substituted at the amino group by one or two, or a combination of, methyl, ethyl, propyl, isopropyl, hydroxyl, benzyl (or benzyl substituted to any extent) or benzylene (or benzylene substituted to any extent) groups and whether or not substituted at the 2-ethyl (beta carbon) position by a hydroxyl, oxo or alkoxy group—and its salts and derivatives and salts of derivatives, including:.
• Isosorbide is a bicyclic chemical compound from the group of diols and the oxygen-containing heterocycles, containing two fused furan rings.
• In an intramolecular version of the Reissert reaction, a furan ring-opening provides the carbonyl necessary for cyclization to form an indole.
• It is structurally related to coumarin by the addition of a fused furan ring, and may be considered as a derivative of umbelliferone.
• It was later extended to conjugated molecules such as pyridine, pyrrole and furan that contain atoms other than carbon and hydrogen (heteroatoms).
• Perilla ketone is a natural terpenoid that consists of a furan ring with a six-carbon side chain containing a ketone functional group.
• Unlike the related 5-membered heterocycles pyrrole, thiophene, and furan, the aromaticity of phospholes is diminished, reflecting the reluctance of phosphorus to delocalize its lone pair.
• BuLi/TMEDA is able to metallate or even doubly metallate many substrates including benzene, furan, thiophene, N-alkylpyrroles, and ferrocene.
• The initial diketone is converted to a thioketone with a sulfurizing agent, which then undergoes the same mechanism as the furan synthesis.
• Limpricht was a pupil of Friedrich Wöhler; he worked on the chemistry of furans and pyrroles, discovering furan in 1870.
• 1,4-Dioxin can be prepared by cycloaddition, namely by the Diels–Alder reaction of furan and maleic anhydride.
• There are many important organic solvents that contain oxygen, among which: acetone, methanol, ethanol, isopropanol, furan, THF, diethyl ether, dioxane, ethylacetate, DMF, DMSO, acetic acid, formic acid.
• Autoinducer-2 (AI-2) is a furanosyl borate diester or tetrahydroxy furan (species dependent) that—as the name suggests—is an autoinducer, a member of a family of signaling molecules used in quorum sensing.
• Glycerol and acetic acid are examples of retained semisystematic names; furan and anisole are examples of retained trivial names.
• Diene: furan, pyrrole > benzene > naphthalene > fulvene > cyclopentadiene > anthracene > butadiene
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• A number of dienes have been employed in the reaction, although cyclic, electron-rich dienes such as those found in the cyclopentadiene and furan ring systems are the best 4π systems for this process.
• It is the most potent knockdown pyrethroid (even stronger than pyrethrin II) but it is relatively unstable, especially when exposed to light (due to both the furan ring and the thiolactone group in the molecule).

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