| http://www.w3.org/ns/prov#value | - inic acids and their salts which contain these structural units.Especially if the reaction is carried out in dilute solution, cyclopolyaddition can also generate cyclopolyphosphinic acids or their salts of the formula (IX) as by-products##STR00012## where X is a hydrogen atom or 1/m of a metal of valency m, R.sub.1 and R.sub.2 may be identical or different and are hydrogen, a carboxy group, a carb
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