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