| http://www.w3.org/ns/prov#value | - In preferred products of formula (iv), the two chlorine atoms are in the 2,3-, 2,4-, 2,5- or 3,4-positions, and in these preferred products of formula (iv), those in which X is a direct bond and R is a group --NR1 R2 in which R1 is hydrogen or a (C1 -C6)-alkyl and R2 is a non-aromatic carbocyclic radical containing from 3 to 15 carlDon atoms are particularly preferred.
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