Williamson ether synthesis

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Williamson ether synthesis was developed by Alexander Williamson in 1850. It involves the reaction of an alkoxide ion with primary alkyl halides and tosylates via an S_N2 reaction.

The Williamson reaction is a nucleophilic substitution in which the alkoxide ion displaces the halide, forming an ether and an inorganic salt. An example is the reaction of sodium ethoxide with chloroethane to form ethoxyethane ("diethyl ether") and sodium chloride:

Na⁺C₂H₅O^- + C₂H₅Cl → C₂H₅OC₂H₅ + Na⁺Cl^-

This reaction is of importance in the history of organic chemistry as it is by this reaction that the structure of ethers was proved.

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