tautomers


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tautomers

Structural ISOMERS that exist in equilibrium with each other. They have identical chemical formulae but their molecular structures differ slightly. A change in tautomeric form in the bases in DNA can cause a mutation as the alteration in the position of the atoms can interfere with the formation of HYDROGEN BONDS between the base pairs.
References in periodicals archive ?
However under the standard conditions the title compounds are pure keto- tautomers which is consistent with the experimental results.
1]H NMR) and UV-vis spectroscopy, X-ray analysis (20), (21) or fluorescence spectroscopy (22), (23), the latter arguing the formation of keto tautomer accompanied of a large Stokes shift (100 nm).
Deprotonation of these two tautomers in aqueous solution is also investigated.
Once the structure is drawn, the program can check for tautomers, and adjust the bond length and angle according to hybridization simplifying the task of drawing complex structures.
alkylsilylation of aldohexoses yields four cyclic tautomers in various amounts.
For the first time the values of proton affinities were calculated taking into account the contributions of rare tautomers of cytosine and guanine and the ir protonated forms.
3] showed the following characteristics: a complex series of signals at 1-4 ppm which we assigned to various aliphatic protons, the number of peaks being doubled because both enol and keto tautomers were present (Fig.