Preparation of 3,6,9-trinitro-3,6,9-trinitro-3,6,9-trinitro-4 - (4-ethylbenzene) - crystalline undecanone and its process for preparation of primvist

摘要

The Invention relates to a process for the preparation of diacid 3,6,9 - triaza 3,6,9 - tris - (carboxymethyl) - 4 - (etoxibencil undecanoic) - Crystal formula I by saponification of Ester di - Tert Butyl diacid 3,6,9 - triaza 3,6,9 - tris - (ter.- butoxicarbonilmetil) - 4 - (etoxibencil undecanoic) - of the formula II in an aqueous solution of alkali metal hydroxide and use of diacid 3,6,9 - triaza 3,6,9 - tris - (carboxymethyl) - 4 - (etoxibencil) - undecanoic of formula I for the preparation of the gadolinium complex of diacid 3,6,9 - TR Iaza 3,6,9 - tris - (carboxymethyl) - 4 - (etoxibencil undecanoic) - [(GD EOB DTPa) = primovistu00ae].