hemiacetal

(ˌhɛmɪəˈsiːtæl)

any of a class of compounds derived from aldehydes by adding an alcohol to the carbonyl group

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Noun

hemiacetal - an organic compound usually formed as an intermediate product in the preparation of acetals from aldehydes or ketones

organic compound - any compound of carbon and another element or a radical

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References in periodicals archive

The results were confirmed by means of spectrophotometers analysis at the UV-visible region, were the maximum absorption band is 230 nm ([lambda]max.MeOH) corresponds to triterpenes, the bands in 280 and 330 nm (Xmax.MeOH) are for phenolic compounds and flavonoids, the band in 280 nm corresponds to the A ring absorption (hemiacetal) and the band in 370 nm represents the flavonoids B ring (Figure 2).

Phytochemistry, antioxidant potential and antifungal of Byrsonima crassifolia on soil phytopathogen control/Fitoquimica, potencial antioxidante e antifungico de Byrsonima crassifolia no controle de fitopatogenos de solo

Polysaccharides have many functionalities, which include the capability of their hydroxyl groups and hemiacetal ends to reduce metal precursor salts [61].

Bacterial Exopolysaccharides as Reducing and/or Stabilizing Agents during Synthesis of Metal Nanoparticles with Biomedical Applications

To the resulting hemiacetal (1.04 g, 3 mmol), monoester 1 (0.61 g, 3 mmol), EDC (0.74 g, 3 mmol x 1.3 eq.), and catalytic amount of DMAP were added under nitrogen with C[H.sub.2][Cl.sub.2] (30 mL).

Synthesis, Characterization, X-Ray Crystallography, and Antileishmanial Activities of N-Linked and O-Linked Glycopyranosides

In the course of investigating nucleoside synthesis using a dehydrating reagent, glycosyl fluoride was formed as the by-product in good yield starting from the hemiacetal. In the early 1980's, the synthesis of glycosyl fluorides was a problem because preparative methods usually included the use of hazardous anhydrous hydrogen fluoride.

Development of chemical and chemo-enzymatic glycosylations

For flavonoid O-glycosides, heterolytic cleavage of hemiacetal O-C bond often occurs with loss of the sugar moiety.

Quantitative Analysis and Comparison of Flavonoids in Lotus Plumules of Four Representative Lotus Cultivars

Natural AP sites occur in equilibrium states between the hemiacetal and the aldehyde forms.

In What Ways Do Synthetic Nucleotides and Natural Base Lesions Alter the Structural Stability of G-Quadruplex Nucleic Acids?

One is the ring-opening reaction of the depolymerized xylan unit through the cleavage of the hemiacetal bond (between oxygen and C-1 on the pyran ring), followed by dehydration between the hydroxyl groups on the C2 and C5 positions.

Characteristics of cotton stalk torrefaction catalyzed by magnesium chloride

XLR-11 was metabolized by phase I and II enzymes in human hepatocytes; more than 25 XLR-11 metabolites were produced by hydroxylation, carboxylation, hemiketal and hemiacetal formation, internal dehydration, and further glucuronidation of some oxidative metabolites.

First metabolic profile of XLR-11, a novel synthetic cannabinoid, obtained by using human hepatocytes and high-resolution mass spectrometry

Furthermore there was a possibility of unstable hemiacetal formation which does not contribute in the overall antiglycation effect of these molecules.

Acylhydrazide Schiff Bases: Synthesis and Antiglycation Activity