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The title compounds are formed in the reaction of o-phosphinophenole with N-arylimide chlorides of carbonic acids. The primary adducts of formimmonium chlorides, however, undergo [2 + 2]-cycloaddition to furnish 1,3-diphosphetanes. A further way to 1,3-benzoxaphospholes consists in the cyclodehydratization of carbonic acid o-phosphinophenyl esters by means of P4O10.
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