✍ Scribed by Jack J. Fox; David Shugar
No coin nor oath required. For personal study only.
SLJMMAIIY. --'I'hc, ultraviolct absorption spectra of' several burbituric acid dcrivntivcs have bern Incvisured a i d their :ipp:ircrit dissociation constants cletcrrriirietl.
The variatioii of the spectra of I)url)ital sncl its N-methyl derivatives with pH is sliowir to be explic*nt)le on the basis of' ionic dissociation.
'l'lie spectrum of barbituric3 acid, in which only two of the three potentitilly-dissoc.ii~ble groiip\ :we caxhibitcd. is discussed in relation t o other spe(6tral chracteristic*s.
The sites of enolizations in barbituric acid and barbital and the order in wlrirh these ionic equilibria occur as a function of pI1 are suggested.
📜 SIMILAR VOLUMES
The photophysical properties and acid/base equilibria of 4-pyridoxic acid ( 3-hydroxy-5-(hydroxymethyl)-2-methylpyridine-4-carboxylic acid), the final product of the catabolism of vitamin B 6 , have been studied in aqueous solutions. The ground state of 4-pyridoxic acid exhibits the different proton
Quantitative structure-stability relationships (QSSRs) are formulated for the inclusion complexation of 17 barbituric acid derivatives with alpha- and beta-cyclodextrin. The variation in the complex stability constants K alpha and K beta is found to be partly accounted for by the molar refractivity