1. The term “polyphenylenes” is preferred to “polyphenyls” for the higher polymers where it is desirable to stress the repeating unit rather than a particular molecule with a well-defined structure. This name is in line with current practice in polymer nomenclature. It should also be pointed out that these polymers are not to be confused with polyphenylene oxides, polyphenylene sulfides, etc., which have also been called polyphenylenes in some circles
2. Polyphenyl