Strong Brønsted acids are produced on reduction of diaryliodonium salts containing anions of the type BF 4 − , AsF 6 − , PF 6 − , SbF 6 − by ascorbic acid and its derivatives in the presence of catalytic amounts of copper salts. The cationic polymerizations of cyclohexene oxide, tetrahydrofuran, and s ‐trioxane were studied using the diaryliodonium salt/ascorbate redox couple.
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Crivello et al. (1981) studied this question.
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