tautomer

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tautomer

 [taw´to-mer]
a chemical compound exhibiting, or capable of exhibiting, tautomerism.
References in periodicals archive ?
Furthermore, the appearance of weakband as 2600 [cm.sup.-1] is attributed to thionethiol SH tautomerization. The thiazine 3d is another cyclic compound resulting from refluxing 2e with 2-aminophenol; the structure was proved by disappearance of C=O, as well as the appearance of peak in H-NMR for thiazine H at [delta] 5.1 ppm and appearance for extra peak at [delta] 114 ppm for thiazine ring in [C.sup.13]-NMR.
As shown in Figure 1, molecules that exhibit ESIPT in the ground state exist predominantly as enol (E) forms; however, upon photoexcitation, they undergo tautomerization into keto forms ([E.sup.*] [right arrow] [K.sup.*]) via an ultrafast and irreversible ESIPT process occurring in the subpicosecond time domain [10].
Zhou, Density functional theory study of formamide-formamidic acid tautomerization, Int.
Finally, the Michael addition of pyrazolone to arylidene ethylcyanoacetate followed by cyclization and tautomerization yields pyranopyrazole.
Especially, isoG undergoes keto-enol tautomerization, depending on the solvent polarity, and the enolform of isoG mispairs with T (Fig.
Tautomerization of the hemiacetal form is responsible for the ring opening which results in the formation of cis-chalcones then undergoing further isomerization to trans-chalcones (pH 2-7).
It was suggested that frst ALA enol form is generated by tautomerization. Secondly, ALA enol acts as an electron donor to molecular oxygen, together with an electron transfer from oxy Hb to oxygen resulting in methyl Hb, ALA radical, and [H.sub.2][O.sub.2] generation (27) [H.sub.2][O.sub.2]] and [O.sub.2.sup.*-], which are now present as a result of both ALA and ALA/oxyhemoglobin coupled autoxidation, can interact and generate H[O.sup.-] radicals, which have the highest reactivity among ROS.
It is now believed that the interconversion actually occurs by tautomerization of an enamine intermediate formed during the transamination of t-(+)-isoleucine (17-19).
Lupia, the material dissipates incident energy by photo tautomerization and vibrational relaxation.