Acyls

Part of speech: noun

Definitions

1. Radical groups derived from carboxylic acids formed by removal of a hydroxyl group, often involved in organic synthesis and biochemical processes
2. Chemical entities representing parts of molecules created when a hydroxyl ion is replaced in an acid, commonly participating in ester or amide formation
3. Functional groups originating from acids by losing hydroxyl portions, serving as key intermediates in various chemical reactions and metabolic pathways

Etymology: The plural of "acyl", a chemical term for the part of an acid left after its hydroxyl group is removed. The singular is built from Latin "acetum" (vinegar) by way of "aceō", a form of the same root that gives English "acetic", and the suffix "-yl", which chemists attached to the names of molecular fragments called radicals. The chain of meaning is therefore a sour liquid, then its chemical core, then a fragment named after that core. Acyls matter because the acid they come from can be recombined with other molecules. When an acyl group bonds to an alcohol, the result is an ester; when it bonds to an amine, the result is an amide. Much of organic chemistry depends on this pattern of swapping one piece of a molecule for another.

Synonyms: acyl groups, acyl radicals