Snamprogetti S.p.a.

Snam Progretti S.p.a.

Pierpaolo Garibaldi

Fausto Calderazzo

Marco Pasquali

A chelated compound of uranium (IV) or thorium is prepared by reacting an anhydrous halide of uranium (IV) or thorium with a chelating agent such as acetylacetone in the presence of an anhydrous solvent and gaseous ammonia in the temperature range of 10 to 60.degree. C.

Process for the preparation of uranium (IV) chelated compounds and

A method is disclosed for the preparation of ytterbium(III) beta-diketonates, the improvement consisting in that the reaction between an ytterbium(III) halide and a chelating agent (such as acetylacetone, dibenzoylmethane and dipivaloylmethane for example) is caused to take place in an anhydrous medium and in the presence of gaseous ammonia, the ytterbium(III) halide being also anhydrous.

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San Donato Milanese, Italy

Pierpaolo Garibaldi