Anagram & Information om | Engelska ordet KETENE

Exempel på hur man kan använda KETENE i en mening

• In organic chemistry, a ketene is an organic compound of the form , where R and R' are two arbitrary monovalent chemical groups (or two separate substitution sites in the same molecule).
• It can be produced by electrical discharge in ketene at low pressure (less than one torr) and its enthalpy of reaction is determined to be about 252.
• The precursor sorbic acid is produced in a two-step process via the condensation of crotonaldehyde and ketene.
• In the proposed reaction mechanism the base first converts the acid chloride to the ketene, the organocatalyst then introduces chirality through its quinonoid tertiary amine, forming a ketene adduct.
• The α-ketocarbene can either undergo a 1,2-alkyl shift, to give the ketene product, or can undergo a 4π electrocyclic ring closure, to form an antiaromatic oxirene.
• Ketene itself dimerizes mainly to give the lactone called diketene as well as a small amount of 1,3-cyclobutanedione.
• A further early diphenylketene synthesis originates from Eduard Wedekind, who had already obtained diphenyl ketene in 1901 by the dehydrohalogenation of diphenylacetyl chloride with triethylamine, without isolation and characterization though.
• Cyclopropanone has been prepared by reaction of ketene with diazomethane in an unreactive solvent such as dichloromethane.
• In 2022, researchers at Portland State University used an e-nail to vaporize CBD-acetate, CBN-acetate, and THC-O-acetate (referred to simply as "THC acetate") to screen for the presence of ketene formation when vaporizing.
• A Mukaiyama aldol addition (magnesium bromide / toluene) took place between aldehyde 7 and ketene silyl acetal 8 with 71% stereoselectivity to alcohol 9 which was protected as the TBS ether 10 (TBSOTf, 2,6-lutidine).
• Certain diketenes with two aliphatic chains, such as alkyl ketene dimers (AKDs), are used industrially to improve hydrophobicity in paper.
• McElvain was known for his research on the mechanism of the Claisen condensation and on the chemistry of ketene acetals.
• Industrially, it is produced by the carbonylation of methylene chloride, oxidation of vinylidene chloride, or the addition of chlorine to ketene.
• Ketene cycloadditions are the reactions of the pi system of ketenes with unsaturated compounds to provide four-membered or larger rings.
• For example, using a simple chiral thiourea catalyst, the asymmetric Mannich reaction of aromatic imines with silyl ketene acetals can be catalyzed with high ee in near quantitative conversion.
• He developed the paradigm of Lewis base activation of Lewis acids and successfully applied it to the asymmetric addition of a broad range of nucleophiles to silyl ketene acetals, iodo- and bromo-functionalization of alkenes, and enantioselective thio- and seleno-functionalization of alkenes.
• in organic chemistry from the University of Wisconsin in the field of substituted ketene acetals and related orthoesters.
• Alkyl ketene dimers (AKDs) are a family of organic compounds based on the 4-membered ring system of oxetan-2-one, which is also the central structural element of propiolactone and diketene.
• β-Butyrolactone is obtained in 63% yield by the addition of ethanal to ethenone (ketene) in the presence of the clay mineral montmorillonite.
• For his thesis, he measured and analyzed the spectra of highly vibrationally excited molecules, and, with fellow student I-Chia Chen, he measured and interpreted the photofragment excitation spectra of ketene.

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