Also ‑oyl.
Forming names of chemical radicals.
Greek hulē, material, matter.
Examples include acetyl, the radical CH3CO- derived from acetic acid; benzyl, the C6H5CH2‑ group from toluene; carbonyl, the CO- group; ethyl, the C2H5‑ group from ethane; hydroxyl, the -OH group; methyl, the CH3‑ group from methane; and phenyl, the C6H5‑ group from benzene.
The ending ‑oyl forms the names of acid radicals from associated carboxylic acids, whose names end in ‑oic: benzoyl from benzoic acid, caproyl from caproic acid, pantoyl from pantanoic acid.
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