Compounds formally derived from an oxoacidRkE(=O)l(OH)m, (l ≠ 0) and an alcohol, phenol, heteroarenol, or enol by linking with formal loss of water from an acidic hydroxy group of the former and a hydroxy group of the latter. By extension acyl derivatives of alcohols, etc. Acyl derivatives of chalcogen analogues of alcohols (thiols, selenols, tellurols) etc. are included. E.g. R'C(=O)(OR) , R'C(=S)(OR) , R'C(=O)(SR) , R'S(=O)2(OR) , (HO)2P(=O)(OR) , (R'S)2C(=O) , ROCN (but not R–NCO ) (RH).
O-Alkyl derivatives of other acidic compounds [see amides (1)] may be named as esters but do not belong to the class esters proper. E.g. (Ph)2POCH3 methyl diphenylphosphinite.
See also: acylals, ortho esters, depsides, depsipeptides, glycerides, lactides, lactones, macrolides
PAC, 1995, 67, 1307 (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1334