Esters are divided into organic acid esters and inorganic acid esters. The ester of monohydric alcohol is carboxylic acid name+alcohol name+ester, named after acid (alcohol) ester; The ester of polyol is alcohol name+carboxylic acid name+ester, named after an acid ester of alcohol.

Dicarboxylic acids can form acid esters and neutral esters; Simple ester, mixed ester. The molecular formula of saturated monoester is CnH2nO2, (n is greater than or equal to 2), and the general structural formula is R 1COOR2(R 1, R2 is a hydrocarbon group).

Alkoxy compounds are compounds in which hydrogen in hydroxyl group of alcohol is replaced by metal, and they are used as nucleophiles, condensation agents and oxidants in organic synthesis.