| http://www.w3.org/ns/prov#value | - Alternatively, compounds of the general formula III, where R2 is halogen such as Cl, Br or I (scheme 1), are obtained by means of regioselective electrophilic aromatic substitution, well known to chemists skilled in the art, with appropriate electrophiles such as N-chlorosuccinimide, N-bromosuccinimide, bromine, iodine or iodochloride in a suitable solvent such as acetic acid, as described in ???E
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