| http://www.w3.org/ns/prov#value | - The reaction with an olefin can be effected, for example, in the presence of an acid catalyst, for example a Lewis acid, such as boron trifluoride, a sulphonic acid, for example p-toluenesulphonic acid, or, especially, a basic catalyst, for example sodium or potassium hydroxide, advantageously in an inert solvent, such as an ether, for example diethyl ether or tetrahydrofuran.
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