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The aprotic organic solvents used for the esterification reaction are preferably aliphatic or aromatic hydrocarbons, such as petroleum ether, cyclohexane, benzene or toluene; or ethers, such as diethyl ether, tetrahydrofuran or dioxane; acid amides, such as dimethylformamide or nitriles, such as acetonitrile, can also be employed.
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