{HEAD ~ A process} 1, wherein said {TAIL ~ 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 the halide of the metal in an inert organic solvent at a temperature of from 50° C. to 150° C 
{ HEAD ~ A process } 1 , wherein said { TAIL ~ 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 the halide of the metal in an inert organic solvent at a temperature of from 50 ° C. to 150 ° C
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