| 摘要 |
This invention relates to a composition producible by mixing an iron carbonyl complex selected from among the group Fe(CO)5, Fe2(CO)9, Fe3(CO)12 or of anhydrous iron salts FemXn, wherein m=1 or 2 and n=2 or 3 and X=halide, carbonate, nitrate, nitrite, sulfide, sulfate, phosphate, rhodanide, acetate, acetylacetonate or a mixture of two or three of these compounds with a cyclopentadiene derivative of the general formula I, wherein R1 to R5 mutually independently denote H, C1 to C12 alkyl, C5 to C8 cycloalkyl, which may in turn bear C1 to C12 alkyl groups, C6 to C14 aryl, alkylaryl, arylalkyl, wherein two adjacent residues may together form saturated or unsaturated C3 to C14 cycles, or denote -SiR6R7R8, wherein R6 to R7 may mutually independently mean C1 to C4 alkyl, C5 to C8 cycloalkyl or C6 to C14 aryl, and 1,4-dichloro-2-butene and/or 3,4-dichloro-1-butene, and to the use thereof as a catalyst, in particular in a process for isomerizing 1,4-dichloro-2-butene to yield 3,4-dichloro-1-butene or vice versa.
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