| http://www.w3.org/ns/prov#value | - When in step (2) of the method according to the invention, use is made of the functional monohalogenated compound, such as is described above, it is advantageous to carry out the reaction of this step in the presence of a small quantity (for example 0.1 to 10% by weight) of at least one phase transfer catalyst in particular a quarternary ammonium chloride (for example, tetrabutylammonium chloride)
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