An acylcarbene is a highly reactive intermediate in organic chemistry that contains a carbene group and an acyl group. It can be formed by various methods, such as thermal or photochemical decomposition of acyl azides, ketenes, or diazo compounds. Acylcarbenes have a linear or bent geometry, depending on the substituents attached to the carbene center. Acylcarbenes are very reactive due to their high energy and electron deficiency, and can react with a wide range of nucleophiles, such as alkenes, alkynes, and aromatic compounds. Some common reactions of acylcarbenes include cyclopropanation, ylide formation, and insertion into C-H bonds. Acylcarbenes are useful intermediates for the synthesis of complex organic molecules, and their reactivity can be controlled by modifying the structure of the precursor or by using suitable reaction conditions. However, the instability and high reactivity of acylcarbenes also make them challenging to study and handle in the laboratory.
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