Alpha-halo-n-acyl-hydrazone
Alpha-halo-n-acyl-hydrazone - Related Videos
01:27
Halo Effect
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2025
The halo effect is a cognitive bias in which an individual's overall impression influences judgments about their specific traits. This psychological phenomenon leads people to associate positive characteristics with those they perceive as generally good and negative characteristics with those they view as bad. This effect is particularly influential in social perception, professional evaluations, and decision-making processes.The Psychological Basis of the Halo EffectThe halo effect is rooted...
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Metabolic Glycoengineering of Sialic Acid Using N-acyl-modified Mannosamines
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Sialic acid is a typical monosaccharide-unit found in glycoconjugates. It is involved in a plethora of molecular and cellular interactions. Here we present a method to modify cell surface sialic acid expression using metabolic glycoengineering with N-acetylmannosamine derivatives.
09:58
Metal-free Synthesis of Ynones from Acyl Chlorides and Potassium Alkynyltrifluoroborate Salts
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The goal of this manuscript is to demonstrate a straightforward method for the preparation of ynones from acyl chloride and potassium alkynyltrifluoroborate salt starting materials. The one-pot reaction proceeds rapidly in the presence of boron trichloride without exclusion of air and moisture.
08:31
Detection of Protein S-Acylation using Acyl-Resin Assisted Capture
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Cited by 29 •
2020
Acyl-RAC (Acyl-Resin Assisted Capture) is a highly sensitive, reliable and easy to perform method to detect reversible lipid modification of cysteine residues (S-acylation) in a variety of biological samples.
01:19
Amines to Amides: Acylation of Amines
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2025
Various carboxylic acid derivatives (such as acid chlorides, esters, and anhydrides) can be used for the acylation of amines to yield amides. The reaction requires two equivalents of amines. The first amine molecule functions as a nucleophile and attacks the carbonyl carbon to produce a tetrahedral intermediate. This is followed by the loss of the leaving group and restoration of the C=O bond. Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary amide...
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The conjugated C=N-NH-C(O) framework polarizes the molecule, so electron distribution is not uniform across the hydrazone region. At the same time, the adjacent carbon-halogen bond presents a separate electrophilic site. This arrangement allows electronic polarization and carbon-halogen reactivity to operate together, helping determine which transformation becomes favorable.
Substituents, bases, solvents, and temperature can shift the balance among competing reaction pathways. These variables affect how readily nucleophilic substitution, elimination, or cyclization occurs at the activated carbon-halogen region. Comparing products under changed conditions therefore helps researchers connect molecular structure and reaction environment with selectivity and product formation.
The carbon-halogen bond can support different outcomes rather than a single universal reaction. Nucleophilic substitution replaces the halogen-containing site, elimination removes components to form a different unsaturated arrangement, and cyclization uses the molecule's reactive functions to build a ring. The preferred pathway depends on the surrounding chemical conditions and molecular substituents.
A practical study compares reactions while changing one influential condition at a time, such as the base, solvent, temperature, or substituent pattern. Researchers then examine which products form and whether substitution, elimination, or cyclization predominates. This approach links reaction conditions with chemical reactivity and helps identify conditions that favor a desired pathway.
Their complementary reactive sites make them useful intermediates for assembling structurally diverse heterocyclic compounds. The polarized hydrazone portion and neighboring carbon-halogen electrophile can participate in transformations that create new connectivity and, under suitable conditions, ring structures. Consequently, these compounds provide a platform for exploring synthetic routes toward varied heterocyclic architectures.
The products indicate how the molecule responded to its reaction environment. A substitution product points to nucleophile-driven displacement, whereas elimination or cyclization products show that alternative pathways became competitive. Comparing these outcomes across substituents, bases, solvents, and temperatures provides evidence about reaction selectivity and the factors controlling transformation of the intermediate.