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Ester Definition: An ester is an organic compound where the hydrogen in the compound's carboxyl group is replaced with a hydrocarbon group. Examples: Ethyl acetate is an ester. The hydrogen on the carboxyl group of acetic acid is replaced with an ethyl group. Article. Chemistry.
In the case of ethyl acetate, R 1 is a CH 3 group and R 2 is a CH 3 CH 2 group. Naming esters systematically requires naming the functional groups on both sides of the bridging oxygen. In the example above, the right side of the ester as shown is a CH 3 CH 2 group, or ethyl group.The left side is CH 3 C=O, or acetate.The name of the ester is therefore ethyl acetate. Deriving the names of the side from the carboxylic acid merely requires replacing the suffix âic with âate. Concepts The principle concept introduced in this lesson is organic synthesis of esters.General nomenclature of esters is also introduced.he name of the ester is therefore ethyl acetate. Deriving the names of the side from the carboxylic acid merely requires replacing the suffix âic with âate. Concepts. The principle concept introduced in this lesson is organic synthesis of esters.