Benzene sulphochloride → 4-{4-[(Benzenesulfonyl)oxy]benzenesulfonyl}phenyl benzenesulfonate

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Reaction Steps

Alternatively, the sulfonyl halide may be reacted with bisphenolate in the first stage in a molar ratio of more than 1:1 to 2:1 under the reaction conditions described. For example, if one mole of disodium-bis-(4-hydroxyphenyl)-sulfone is reacted with 2 moles of benzene sulfochloride, there is obtained bis-(4-phenylsulfonyloxyphenyl)-sulfone, which may then be condensed, in the subsequent polycondensation stage, again with one mole of disodium-bis-(4-hydroxyphenyl)-sulfone to form the polyether. This condensation is preferably carried out in a solvent which has already been used for the synthesis of the alkali metal salt. At a lower excess of sulfonyl halide, e.g. a ratio of from 1.5:1, there are obtained in the first stage mixtures of bis-(4-phenylsulfonyloxyphenol)-sulfone and the sodium salt of 4-(4-phenylsulfonyloxyphenyl-sullfone)-phenol, which may then be condensed with appropriately smaller quantities of disodium-bis-(4-hydroxyphenyl)-sulfone to form the polyethers.

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