LITHIUM COMPLEXES OF N-(1-HYDROXYMETHYL-2,3-DIHYDROXYPROPYL)-1,4,7-TRISCARBOXYMETHYL-1,4,7,10-TETRAAZACYCLODODECANE, PRODUCTION AND USE THEREOF

摘要

The invention relates to crystalline lithium complexes of N-(1-hydroxymethyl - 2,3-dihydroxypropyl)-1,4,7-triscarboxymethyl-1,4,7,10 tetraazacyclododecane of formula (I), wherein: all of the three X's represent n lithium ions and m hydrogen atoms, whereby n and m each represent numbers from 0 to 3, preferab ly from 0.8 to 2.2, and the sum of n and m equals 3, and; Y represents chloride and bromide. The invention relates to the preparation of the inventive complexes and to production of the salt-free gadolinium complex of N-(1- hydroxymethyl-2,3-dihydroxypropyl)-1,4,7-triscarboxymethyl-1,4,7,10 tetraazacyclododecane from the same without involving the use of ion exchangers.