Characterization of crystalline L-carnosine Zn(II) complex (Z- 103), a novel anti-gastric ulcer agent: tautomeric
change of imidazole moiety upon complexation.
As a result, we now report the isolation and structural elucidation of two tautomeric
compounds: 4-(3-bromopropoxy)-3-methoxy phenyl methanol (1) as well as 4-(3-bromopropoxy)-3-methoxybenzaldehyde (2) along with their theoretical studies.
The resulting Schiff bases could change into ketoamine tautomeric
forms with the formation of cyclic structure due to intra hydrogen bonding with better thermal stability (Fig.
For example, the thiourea structure in QuadraPure TU can take the tautomeric
iminothiol structure (Scheme 2) .
Orth, "The importance of methyl positioning and tautomeric
equilibria for imidazole nucleophilicity," Chemistry-A European Journal, vol.
The aromatic 1H-pyrazole product is isolated as a tautomeric
form depending on the substituents and other parameters ; here, we attributed the 1,5-tautomer form from NMR CD[Cl.sub.3] solution analysis data and 1,3-tautomer form from the crystal X-ray diffraction data (Tables 3 and 4; Figures 5 and 6).
Amino acids such as Asp, Lys, and His were assigned as protonated and tautomeric
at pH 7.4.
DFT/B3LYP method is a suitable method used to investigate the physicochemical properties of proposed tautomeric
forms of aroylhydrazones and E/Z configuration with respect to the C=N double bond
Furthermore, in the 6,8-diketo tautomeric
form of [o.sup.8]G , the donor-acceptor arrangement of the Hoogsteen H-bonding changes, which again would have predicted the destabilization of the parallel GQ by the [o.sup.8]dG tetrad.
Absolute configuration and tautomeric
structure of xylindein, a bluegreen pigment of Chlorociboria species.