Abstract
Benzene-ring centred di- and tri-hydroxamic acids (9a–c and 10a–c) having oligo(ethyleneoxy) chains are prepared by reaction of benzene-di- and -tri-carbonyl chlorides with amino [oligo(ethyleneoxy]ethyl hydroxylamine derivatives (6a–c). Trihydroxamic acids (10a–c) form more stable iron(III) complexes than dihydroxamic acids (9a–c) in several respects. In iron(III) transport experiments using a H2O–CHCl3/CCl4 system, however, compounds (9a–c) show greater rates than compounds (10a–c). The number of ethyleneoxy units in the arm apparently influences these iron(III) holding properties and the iron-transport rates.
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