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- W2070335391 abstract "In the reactions of (η-C5H5)2Rh2(μ-CO)(μ-η2CF3C2CF3) (1) with thiophene and furan, there is ready cleavage of two CH bonds in the heteroaromatics leading to the formation of the complexes C(η-C5H5)2Rh2{μ-η1,η2-C(CF3)C(CF3)H}] 2(μ-η1,η1- C4H2E) (E = S or O). With thiophene, a pronounced preference to activate the two CH bonds adjacent to the heteroatom gives the 2,5-dimetallated product with high selectivity; this is attributed to prior coordination of the sulphur to the dirhodium centre. Steric factors are believed to govern the reaction with furan, which gives mainly the 2,4-dimetallated species. The reaction with pyrrole proceeds in a similar manner, but is less extensive. A spontaneous reaction occurs when 1 is dissolved in pyridine, and an ortho-metallated product, (η-C5H5)2Rh2{μ-η1,η2-C(CF3)C(F3)H}(μ-η1,η1-NC5H4), is formed as a result of a single CH bond cleavage reaction. The bridging pyridyl ligand is attached from adjacent carbon and nitrogen atoms. Similar products are formed with 2-fluoropyridine and 4-methylpyridine. However, the presence of a methyl substituent in the 2-position of the pyridine ring causes a change in the stereochemistry of the μ-C(CF3(CF3)H unit from cis to gauche. The reaction with 2-aminopyridine yields two CH bond activated products similar to the above complexes, but two NH bond activated products, (η-C5H5)2Rh2{μ-η1, η2-C(CF3)C(CF3)H}(gm-η1,η1-NHpy) and (η-C5H5)2Rh{2μ-η1,η1- C(CF3)C(CF3)C(O)}(μ-η1-N-py), are formed also." @default.
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- W2070335391 date "1992-01-01" @default.
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- W2070335391 title "The reactions of heteroarenes with (η-C5H5)2Rh2( μ-CO)(μ-η2-CF3C2CF3)" @default.
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- W2070335391 doi "https://doi.org/10.1016/s0277-5387(00)80225-9" @default.
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