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 SN2 reaction. Alexander William Williamson (1824-1904), English chemist, was born at Wandsworth, London, on the 1st of May 1824. ... 1850 was a common year starting on Tuesday (see link for calendar). ... An alkoxide has an organic group bonded to a negatively charged oxygen atom, they are generally basic. ... A halide is a binary compound, of which one part is a halogen atom and the other part is an element or radical that is less electronegative than the halogen, to make a fluoride, chloride, bromide, iodide, or astatide compound. ... The tosylate group with a generic R group attached (where R can be anything, typically a carbon). ... In chemistry, nucleophilic subsitution is a type of chemical reaction in which one nucleophile (electron donor) replaces another as a covalent substituent of some atom. ...
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.
Being a typical aliphatic nucleophilic substitution, the reaction is sensitive to a variety of parameters, such as solvent, temperature, the nature of the leaving group, the nucleophile, and the counter cation.
The applications of Williamsonethersynthesis on solid support are mostly limited to the simplest case of benzyl halide substitution.
Since the initial experiments indicated that the presence of iodide salts and crown ethers improves the outcomes, the screening was performed mostly with iodide and crown ether additives.
Ether is the general name for a class of chemical compounds which contain an ether group — an oxygen atom connected to two (substituted) alkyl groups.
Ethers are not to be confused with the following classes of compounds with the same general structure R-O-R. Aromatic compounds like furan where the oxygen is part of the aromatic system.
In a primary ether this carbon is connected to only one other carbon as in diethyl ether CH An example of a secondary ether is diisopropyl ether (CH and that of a tertiary ether is di-tert-butyl ether (CH Dimethyl ether, a primary, a secondary, and a tertiary ether.
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