Linked from
The 33 pages that link to Ester, each with the reason it gives.
AcetylationRelated: O-acetylation can produce an acetate ester.
Wine aromaRelated: Many fruity wine aromas are associated with volatile esters.
Acyl chlorideRelated: Alcohols react with acyl chlorides to produce esters.
Gallic acidRelated: Gallic acid forms ester bonds with sugars in hydrolysable tannins.