Examples of 'hemiacetal' in a sentence
Meaning of "hemiacetal"
hemiacetal (noun): A type of organic compound that contains a carbon atom bonded to a hydroxyl group (OH), an alkoxy group (OR), and a hydrogen atom. It plays a role in organic chemistry reactions, especially in the formation of acetals and ketals
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- Any of a class of compounds of general formula R₁R₂C(OH)OR' (where R' is not H and R₁ or R₂ is often hydrogen).
How to use "hemiacetal" in a sentence
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hemiacetal
The mechanism of formation is identical to hemiacetal formation.
Dehydration of the hemiacetal gives the resultant furan.
It easily tautomerizes to a furanone hemiacetal form.
The decomposition of this hemiacetal regenerates the natural precursor.
The polyol is preferably a saccharide cyclized in hemiacetal form.
The furanose ring is a cyclic hemiacetal of an aldopentose or a cyclic hemiketal of a ketohexose.
The hydroxyaldehyde equivalent may exist in a hemiacetal structure.
The hemiacetal groups of amylose and amylopectin are oxidised to carboxyl groups or to lactones.
The monosaccharide unit may be a cyclic hemiacetal or hemiketal.
These hemiacetal end units are in equilibrium with the hydroxyaldehyde form of glucose.
This forms an intramolecular hemiacetal.
This hemiacetal exists in some equilibrium mixture with the free hydroxyaldehyde.
The polyol is preferably a cyclized monosaccharide in the hemiacetal form.
This aldehyde is readily cyclized to form a hemiacetal which is in equilubrium with the aldehyde.
A monosaccharide is a chiral polyhydroxyalkanol or polyhydroxyalkanone which typically exists in hemiacetal form.
See also
The hemiacetal bonds were apparently weak enough to release some free glutaraldehyde in dimethylsulfoxide solution.
The aldehyde group is preferably not present as hemiacetal or acetal.
The hemiacetal II is isolated by conventional means.
This method can be used to measure the hemiacetal adduct.
Hemiacetal formation is catalyzed by acids and bases,.
Skeletal formula of a hemiacetal.
The hemiacetal is then activated with donor 1.
It is also possible to use ethyl or butyl glyoxylate in stead of the hemiacetal.
Technical Field The present invention relates to a novel cyclic hemiacetal derivative having a calpain inhibitory activity.
Addition of a first molecule of alcohol on a carbonyl function leads to the formation of a hemiacetal.
A particularly preferred hemiacetal is a solid glutaraldehyde-sucrose hemiacetal.
The reversibility of the hemiaminal groups is typically slower than that of the hemiacetal groups.
As a result, the hemiacetal linkage forms at room temperature.
One preferred class of preferred carbohydrates comprises the group comprising trisaccharides with a free hemiacetal group.
It is preferred to induce decomposition of hemiacetal bonds, while being neutral towards acetal bonds.
These PVA crosslinked materials suffer from hydrolyzable acetal or hemiacetal linkages.
Structural properties = = The furanose ring is a cyclic hemiacetal of an aldopentose or a cyclic hemiketal of a ketohexose.
This aldehyde is cyclized easily to form the hemiacetal 6.
More specifically the disaccharides with a free hemiacetal group the so-called reducing disaccharides.
Likewise, some disaccharides such as maltose and lactose contain a hemiacetal.
This helps keep hemiacetal or acetal formation as low as possible in the solvent-lights column 1.
The resulting acetal IV is then converted to hemiacetal V with mild acid.
The conversion of a hemiacetal to an acetal is an SN1 reaction.
In organic chemistry, a lactol is the cyclic equivalent of a hemiacetal or a hemiketal.
The hemiacetal compound of formula ( La ) has been found to have particularly beneficial stability.
It undergoes rapid polymerization, including forming a hemiacetal cyclic dimer.
The hemiacetal 12a is then transformed to a mixture of hemithioacetals.
Presumably, the two diastereomers are epimeric in the hemiacetal carbon.
Key words, hemiacetal kinetics, preassociation, intermediate lifetime.
Albiflorin has a cyclic structure of lactone, but without a hemiacetal structure.
Hydrogenation of hemiacetal ( 1 ) is preferably conducted in the presence of a hydrogenation catalyst.
Thus, in some embodiments, the compound will comprise a hemiacetal or hemiketal.
Also this hydrate and this hemiacetal can be directly used in step ( M1 ).
In these compositions, heparin is linked to the polymer backbone by acetal or hemiacetal bonds.
The most preferred disaccharides are compounds without a free hemiacetal group the so-called non-reducing disaccharides.
