# 7.3: Ethers, ROR'

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The substituent name for the $$RO-$$ function is alkoxy, and it is correct to name $$R-O-R'$$ compounds as alkoxy derivatives of hydrocarbons:

In the common nomenclature for ethers, each of the $$R$$ groups in $$R-O-R'$$ is named as a separate word, except when the groups are identical, in which case the prefix di or bis may be used (di is used for simple groups, bis for substituted groups):