Williamson ether
SMARTS: [#6;$([#6]~[#6]);!$([#6]=O):2][#8;H1:3].[Cl,Br,I][#6;H2;$([#6]~[#6]):4]>>[CH2:4][O:3][#6:2]
Conditions
Reactant 1: Alcohol.
Reactant 2: alkyl halide (Cl, Br, I).
R1, R2: ar, alkyl.
References
Williamson, A. Ann. Chem. Pharm., 1851, 77, 37–49.
Williamson, A. W. Q. J. Chem. Soc., 1852, 4, 229
Other sources
Organic chemistry Wikipedia