FIELD: chemistry.
SUBSTANCE: present invention relates to an organophbsphorus compound of formula (I), which can be used for selective extraction of thorium (IV) from solutions containing a mixture of thorium (IV), uranium (VI) and lanthanum (III) compounds. 
EFFECT: design of a new highly efficient medium for selective extraction of thorium from a mixture of uranium and lanthanum compounds.
1 cl, 2 ex, 2 tbl
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