| http://www.w3.org/ns/prov#value | - The starting phenoxy phenol of formula III may be prepared by conventional synthetic methods.Alternatively, and preferably, the compounds of formula II are prepared by reacting a compound of formula Z-A with a compound of formula IV ##STR7## where Z is a group as defined above, one of A and B represents a hydroxy group and the other of Aand B represents a leaving group, such as a halogen atom.Cert
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