A process 1, wherein said reaction product of the polyphenol and the halide of the metal is prepared by adding the polyphenol or a solution or suspension thereof in an inert organic solvent to a solution or suspension of {HEAD ~ the halide} of {TAIL ~ the metal} in an inert organic solvent at a temperature of from 50° C. to 150° C 
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A process 1 , wherein said reaction product of the polyphenol and the halide of the metal is prepared by adding the polyphenol or a solution or suspension thereof in an inert organic solvent to a solution or suspension of { HEAD ~ the halide } of { TAIL ~ the metal } in an inert organic solvent at a temperature of from 50 ° C. to 150 ° C
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