| http://www.w3.org/ns/prov#value | - If necessary, the obtained desired compound can be purified by recrystallization, reprecipitation, or the separation by silica gel chromatography etc.(2) An alkyl group having 1 to 6 carbon atoms is introduced by the reaction with an alkyl halide in the presence of a base and either in the presence or absence of a solvent.Preferable examples of bases include alkali metal hydroxides such as sodium
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