In chemistry, an acyl group is a moiety derived by the removal of one or more hydroxyl groups from an oxoacid, [1] including inorganic acids. It contains a double-bonded oxygen atom and an organyl group ( R−C=O ) or hydrogen in the case of formyl group ( H−C=O ).

In organic chemistry, acylium ions are cations with the formula RCO +, where R = alkyl or aryl. [1] . They are a kind of carbocation. Structural details of the acetyl cation. [2] In acylium ions, the C-C-O linkage is linear. The oxygen and the central carbon can be described as sp hybridized.

2022年2月28日 · An acyl anion is a carbanion that has the following general structural formula. R = H, alkyl, aryl. Acyl anions can not be generated in a synthetically useful manner; for all practical purposes, they are hypothetical.

2018年5月8日 · The acylium ion is stabilized by the positive mesomeric effect of the lone pair of electrons on the oxygen atom onto the empty p-orbital of the $\ce{C+}$. This helps achieve octet completion of the carbon atom, and thus imparts stability to the carbocation.

2024年10月26日 · Learn about acylation mechanism for your A-level chemistry exam. Find information on acid chlorides, nucleophilic attack and reaction conditions.

The reaction requires an acyl halide and the corresponding aluminum trihalide. The reaction is commonly carried out only with acyl chlorides. The electrophile is shown as an acyl cation, called an acylium ion, which forms from a Lewis acid-Lewis base complex of aluminum trichloride and the acyl chloride.

An acylium ion is formed by the cleavage of C-Cl bond of the complex. The acylium ion has a positive charge on the carbon and is resonance stabilized. This acylium ion acts as an electrophile and reacts with the arene to yield the monoacylated product (aryl ketone). 1

Acylium ions are reactive intermediates in organic chemistry that feature a positively charged carbon atom bonded to an oxygen atom. They are important in the context of the spectroscopy of aldehydes and ketones, as they can provide valuable information about the structure and reactivity of these carbonyl compounds.

Acylation definition involves a chemical reaction in which an acyl group (-RCO) is introduced into a molecule. This process typically involves the replacement of a hydrogen atom in an organic compound with an acyl group, often through the use of …

An acylium ion is a positively charged ion with the general formula RCO+, where R is an alkyl or aryl group, and it forms during the Friedel–Crafts acylation reaction when an acyl chloride reacts with a Lewis acid catalyst.