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In chemistry, dehydrogenation is a chemical reaction that involves the removal of hydrogen, usually from an organic molecule. It is the reverse of hydrogenation . Dehydrogenation is important, both as a useful reaction and a serious problem.
These reactions often proceed via carbocation intermediates as shown for the dehydration of cyclohexanol. [5] Some alcohols are prone to dehydration. 3-Hydroxylcarbonyls, called aldols, release water upon standing at room temperature: RC(O)CH 2 CH(OH)R' → RC(O)CH=CHR' + H 2 O. The reaction is induced by dehydrating reagents.
The hydrocracking of paraffins is the only one of the above four major reforming reactions that consumes hydrogen. The isomerization of normal paraffins does not consume or produce hydrogen. However, both the dehydrogenation of naphthenes and the dehydrocyclization of paraffins produce hydrogen.
This oxidant is useful for the dehydrogenation of alcohols, [3] phenols, [4] and steroid ketones. [5] DDQ decomposes in water, but is stable in aqueous mineral acid . [ 6 ]
Aromatization is a chemical reaction in which an aromatic system is formed from a single nonaromatic precursor. Typically aromatization is achieved by dehydrogenation of existing cyclic compounds, illustrated by the conversion of cyclohexane into benzene. Aromatization includes the formation of heterocyclic systems. [1]
Dehydrogenation; Delépine reaction; DeMayo reaction; Demjanov rearrangement; Demjanow desamination; Dess–Martin oxidation; Diazoalkane 1,3-dipolar cycloaddition; Diazotisation; DIBAL-H selective reduction; Dieckmann condensation; Dieckmann reaction; Diels–Alder reaction; Diels–Reese reaction; Dienol–benzene rearrangement; Dienone ...
Oxidoreductases, enzymes that catalyze oxidation-reduction reactions, constitute Class EC 1 of the IUBMB classification of enzyme-catalyzed reactions. [2] Any of these may be called dehydrogenases, especially those in which NAD + is the electron acceptor (oxidant), but reductase is also used when the physiological emphasis on reduction of the substrate, and oxidase is used only when O 2 is the ...
Hydrogenation reactions can be done with catalysts like Pt and Ru, supported by Al 2 O 3. For the dehydrogenation, Pd and Ru catalysts supported by carbon are used. [17] Companies like Hydrogenious Technologies GmbH in Germany and HySA Infrastructure in South Africa have adopted the DBT/H18-DBT system as LOHCs.