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this points to the fact that, while relative rates of ( 1) and (3) do not change greatly on substituting bromine for chlorine, reaction 1 is slightly favored by the presence of bromine in the 4-position.If the above mechanism is correct, significant differences in structure should be observed between polymers produced by decomposition of copper complexes and polymers produced with classical free radical initiators. Some preliminary studies of poly(dibromophenylene oxide) show this to be the case. The results of that study will be published elsewhere.