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• W2020007000 endingPage "2541" @default.
• W2020007000 startingPage "2541" @default.
• W2020007000 abstract "Reactions of [UMe2(C5Me5)2] with primary aromatic or aliphatic amines led to the rapid formation of monomeric uranium(IV) complexes [U(C5Me5)2(NHR)2](R = 2,6-dimethylphenyl 1, Et 2 or But3). The compounds were characterized by standard techniques and for 1, by X-ray diffraction. In co-ordinating solvents like tetrahydrofuran (thf) compound 1 reacted intramolecularly releasing one primary amine and forming the imidouranium(IV)[U(C5Me5)2{N(C6H3Me2-2,6)}]·thf 4, whereas in non-co-ordinating solvents the base-free [U(C5Me5)2{N(C6H3Me2-2,6)}]5 was obtained. The thf in 4 was found not to be in equilibrium with bulk solvents, and different proton chemical shifts for the adducted base were observed as a function of temperature following a Curie–Weiss behaviour. σ-Bond metathesis reactions of the bis(amido) and/or imido complexes with terminal alkynes produced the bis(acetylide) complexes [U(C5Me5)2(CCR)2](R = Ph 6 or But7) active species for the regioselective oligomerization of terminal alkynes, which can be prepared also from the reaction of [UMe2(C5Me5)2] with 2 equivalents of the corresponding terminal alkyne. Reactivity studies show the possible interconversion among these bis(amido), imido and bis(acetylide) complexes." @default.
• W2020007000 created "2016-06-24" @default.
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• W2020007000 date "1996-01-01" @default.
• W2020007000 modified "2023-10-11" @default.
• W2020007000 title "Uranium(IV) bis(amido), imido and bis(acetylide) complexes: synthesis, molecular structure, solution dynamics and interconversion reactions" @default.
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• W2020007000 doi "https://doi.org/10.1039/dt9960002541" @default.
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