SYNTHESIS OF METAL-CYCLOPENTADIENYL DERIVATIVES FOR USE AS ULTRAVIOLET ABSORBERS

in a search for metallocene derivatives as additives, monomers, and polymers with high UV radiation resistance, the preparation of osmocene and ruthenocene analogs of o-hydroxybenzophenone was investigated, and a study was made of the conversion of functional cyclopentadienes to ferrocenes. New compounds prepared included ortho hydroxybenzoylosmocene, orthohydroxybenzoylru thenocene, orthomethoxybenzoylruthenocene, 1,1' bis(beta,beta-diethoxyethyl)- ferrocene, 1,1'-bis (beta-hydroxy-ethyl)-ferro cene, (C2H5O)2- CHCH2C5H4)3HFe, (HOCH2CH2C5H4)4H2Fe, dimethyl and diethyl 1,1'-ferrocene-dicarbamates, poly(1,1' ferrocenedimethyl 1,1'-ferrocenedicarbamate), Os2OCl8, 6-carbethoxy-3,4- dihydrofulvene, and cyclopentadienes containing beta-carbethoxyethyl, cyanomethyl, beta,beta-diethoxyethyl, and beta hydroxyethyl groups. Isomeric bis- and tris (trimethylene)ferrocenes were prepared and acetylated. The acetyl products were converted to the corresponding ferrocene-propionic acids, which on cyclization were shown to give homoannularke tonic products, as well as the expected hetero annular compounds.