Abstract: This invention relates to a novel medicinal preparation for treating maladies caused by iron deficiency comprising the sodium salt of o-carboxybenzoylferrocene as the active component.The process for preparing the sodium salt of o-carboxybenzoylferrocene consists in that reacting phthalic anhydride with ethyl alcohol at the alcohol boiling temperature, whereupon the monoethyl o-phthalate obtained is treated with thionyl chloride, after which the obtained monoethyl o-phthalate chloride is used for acylating ferrocene in the presence of a catalyst in methylene chloride medium with heating, with subsequent saponification of the obtained o-carboxylbenzoylferrocene ester and separation of the end product.

Abstract: The method for isolating organometallic compounds that are cyclopentadienyl or benzene .pi.-complexes of transition metals having the general formulaLML'whereL is a non-substituted cyclopentadienyl ring or a non-substituted benzene ring;L' is a non-substituted cyclopentadienyl ring, a non-substituted benzene ring, or carbonyl groups;M is a transition metal,From a mixture with other substances consists in preparing adducts of organometallic compounds with thiourea which does not form such adducts with said substances. According to the invention, said mixture is processed with thiourea in a medium of an organic solvent to prepare entirely novel substances, which are not heretofore known, namely, thiourea adducts with said organometallic compounds. Said adducts are then separated from the substances that do not form such thiourea adducts, and decomposed to isolate the organometallic compounds.