According to the literature survey, the X-ray single crystal study and computational studies related to geometry, electronic properties such as NBO, FMO, and MEP on these tautomeric
compounds have not been explored yet.
Caption: Scheme 2: Tautomeric
structures of thiocarbonyl and thiol.
The actual tautomeric
structure of the coupling products 21A-C was studied and confirmed based on computational data extracted.
In the 6,8-diketo tautomeric
form of [o.sup.8]G , the N7 is a hydrogen donor, instead of acceptor, and therefore only a single H-bonding pattern remains when [o.sup.8]G is present in the tetrad.
Background: Garcinielliptone FC (GFC) is a tautomeric
pair of polyprenylated benzophenone, which has proven to have antiepileptic, cytotoxic and antioxidant activity.
form of curcumin enol is in solid and solution phase is the most stable.
Curcumin can exist in at least two tautomeric
forms, keto and enol.
Focusing on the most common case--the transfer of a proton or hydrogen atom--chemists build a bridge from the basic knowledge discussed in other textbooks and specialized scientific papers, to the results of recent findings and ongoing research into tautomerism, tautomeric
compounds, and methods for studying them.
This situation can arise in the event of a tautomeric
shift (transient rearrangement of a nucleotide base structure, allowing for non-canonical pairing) right as the polymerase comes by.
Furthermore, the placement of a hydroxyl moiety at the number 2 carbon of AQ allows for a tautomeric
shift and orthoquinone formation of the resulting 2OH compound.
Their structures rely upon the corresponding analytical and spectroscopic data and this characterization evidenced the presence of the tautomeric
equilibrium between the two forms reported in Scheme 3.
These pharmaceuticals are weak acidic compounds because of their carboxylic groups or ketoenol tautomeric
structure with their pK values between 3 and 7.