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Silica-bound iodosobenzoate derivatives have been prepared and found to be phosphorolyticaily active against both p-nitrophenyldiphenyl phosphate and the nerve agent, soman.o-Iodosobenzoate, in its valence tautomeric 1-oxido-l,2benziodoxol-3( 111)-one form (l), is a strong K-nucleophile capable of rapidly cleaving reactive phosphates with true catalytic turnover. These properties have important applications in the decontamination of areas affected by toxic I 0phosphate insecticides and nerve agents, so efforts are being made to develop appropriately efficient vehicles for delivery of the catalytic moiety. Accordingly, (1) has been covalently bonded to a surfactant;2 it has been derivatized with watersolubilizing substituents; and it has been solubilized in aqueous micellar solutions, 1,-3 micr~emulsions,~ or liquid crystal^.^

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