255. Absorption spectra of hydroxy-aldehydes, hydroxy-ketones, and their methyl ethers

Abstract

The ultra-violet absorption spectra of 0-, m-, and p-hydroxy-aldehydes , hydroxyketones, and their methyl ethers are described and discussed. The spectra are dominated by absorption maxima which are benzenoid in origin but show considerable displacements. Selective absorption undergoes second-order modifications when hydrogen-bond formation and interaction between hydroxylic solutes and polar solvents occur.

Indigoid pigments derived from a pathological urine

“…This band with its superimposed fine structure may be considered as characteristic of the benzoyl group acting as a chromophore. This evidence supports the similar interpretation of Morton & Stubbs (1940).…”

Aryl Ketones fromAcronychia pedunculata with Cyclooxygenase-2 Inhibitory Effects

“…The IR spectra showed strong absorption at 1605 cm À1 (CO), which is consistent with the UV maxima at 220, 286, and 328 nm for 2,4,6-trioxygenated acetophenones [21]. The (Fig.…”

The Stigmatic Secretion of the Sweetpotato

“…However, data obtained were not adequate to characterize the two minor phenolics yielding glucose as glycosides or glucose-esters. The absorption spectrum of the principal compounds is not in agreement with that of a number of other natural phenolic and related substances (Harborne and Corner, 1961;Harborne, 1960;Lemon, 1947;Campbell and Coppinger, 1951;Morton and Stubbs, 1940). On the other hand, both the absorption spectrum and the bathochromic shifts are similar, if not identical, to those of the methyl ester of caffeic acid (Harborne,19(4).…”