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Ketene from carboxylic acid hydrogenation.

Ketene from ethanol dehydrogenation on RufOOOl . Reproduced from Ref. 22b with permission from Springer Verlag.

Ketene generation by ester thermolysis in natural product synthesis.

Ketene generation from acetylated cellulose.

Ketene Mechanism with Acetic Acid Forming Surface Ketene Intermediate

Ketene to ketenimine conversion and cyclization.

Ketene-based mechanism for the rearrangement of Zincke aldehydes .

Ketene-chloral-quinidine acetate transition state.

Ketenes from alkynyl phosphonates in insecticidal action.

Keteniminium ion-initiated cascade cationic polycycUzation

Ketenyl formation via carbyne-carbonyl coupling Wl 2 WCp

Ketimine chemistry

Ketimines from ketones and primary amines.

Ketjen MAT simulates FCC bed reactor.

Keto and enol forms of 1,3-diketones.

Keto bile acid oxalates as catalysts

Keto enol and amino imino tautomeric forms of uracil, cytosine, adenine, guanine. The keto and amino forms predominate, the enol and imino forms are only present in equilibrium at 0.01 Vo or less

Keto enol forms of various compounds.

Keto oxazoles as hydroxamic acid replacements.

Keto-add pathways for the production of n-butanol, isobutanol, and related compounds. Enzyme abbreviations

Keto-endrin, identified by Matsumura et al. as a product of endrin degradation by soil microorganisms

Keto-enol and amino-imino tautomerism in nucleoside bases. Arrows denote A and D, which symbolize acceptor and donor sites for hydrogen bond formation. Note that in the enol forms, G becomes equivalent to A, and U becomes equivalent to C. In the imino forms, A is equivalent to U or G, and C is equivalent to U. The situation changes if the imino or enol groups rotate, giving rise to a diversity of hydrogen-bonding possibilities.

Keto-enol eqnilibrinm. The curved arrows are used to depict electron motion connecting the starting enol to the ending ketone. Although an equilibrium, the path intended to be depicted by the curved arrows runs from the enolate anion at the lower left to the keto isomer on the upper left.

Keto-enol equilibria.

Keto-enol equilibrium in acetone.



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