For the first time the reaction ability of bromoderivatives of benzo-and dibenzocrown ethers at sorption of So,4',4'',
dibenzo-18-crown-6 has low level of activity, but in going from [4.4]dibenzo-24-crown-8 to its 4',4'',(5'')-dibromoderivative the sorption properties when extracting some elements from water solutions of hydrochloric acid increase in hundreds of times. Thus, a new highly selective agent for the extraction and separation of elements from multicomponent mixtures was found. Despite rather close spatial and electronic parameters, the reaction ability of 4',4'',(5'')-dibromo-and 4',4'',(5'')-diiodo[4.4]dibenzo-24-crown-8 differs dramatically because the latter is absolutely unselective and extracts 28 elements of all studied to the same extent.Keywords: Benzo-and dibeznocrown ethers, halogenoderivatives, sorption, acidic solutions, elements.Краун -эфиры в экстракции и сорбции. I. Бромпроизводные бензо -и дибензокраун -эфиров в процессах сорбции элементов из кислых водных растворов