Dehydrocoupling of dimethylamine-borane catalysed by rhenium complexes and its application in olefin transfer-hydrogenations.
نویسندگان
چکیده
Re(I) complexes are applied as catalysts for the dehydro-coupling of Me2NH.BH3 and the transfer-hydrogenation of olefins.
منابع مشابه
Synthetic and mechanistic studies of metal-free transfer hydrogenations applying polarized olefins as hydrogen acceptors and amine borane adducts as hydrogen donors.
Metal-free transfer hydrogenation of polarized olefins (RR'C=CEE': R, R' = H or organyl, E, E' = CN or CO(2)Me) using amine borane adducts RR'NH-BH(3) (R = R' = H, AB; R = Me, R' = H, MAB; R = (t)Bu, R' = H, tBAB; R = R' = Me, DMAB) as hydrogen donors, were studied by means of in situ NMR spectroscopy. Deuterium kinetic isotope effects and the traced hydroboration intermediate revealed that the...
متن کاملProbing the second dehydrogenation step in ammonia-borane dehydrocoupling: characterization and reactivity of the key intermediate, B-(cyclotriborazanyl)amine-borane.
While thermolysis of ammonia-borane (AB) affords a mixture of aminoborane- and iminoborane oligomers, the most selective metal-based catalysts afford exclusively cyclic iminoborane trimer (borazine) and its B-N cross-linked oligomers (polyborazylene). This catalysed dehydrogenation sequence proceeds through a branched cyclic aminoborane oligomer assigned previously as trimeric B-(cyclodiborazan...
متن کاملAmino-borane oligomers bound to a Rh(I) metal fragment.
Coordination complexes of previously observed intermediates, H(3)B.NMe(2)BH(2).NMe(2)H and [H(2)BNMeH](3), in the transition metal catalysed dehydrocoupling of H(3)B.NMe(2)H and H(3)B.NMeH(2) have been isolated and structurally characterised using the [Rh{PR'(2)(eta(2)-C(5)H(7))}](+) fragment. Their onward reactivity shows that further dehydrogenation is not a simple intramolecular process.
متن کاملCatalytic dehydrogenation of dimethylamine borane by group 4 metallocene alkyne complexes and homoleptic amido compounds.
Dehydrogenation of Me(2)NH·BH(3) (1) by group 4 metallocene alkyne complexes of the type Cp(2)M(L)(η(2)-Me(3)SiC(2)SiMe(3)) [Cp = η(5)-cyclopentadienyl; M = Ti, no L (2Ti); M = Zr, L = pyridine (2Zr)] and group 4 metal amido complexes of the type M(NMe(2))(4) [M = Ti (8Ti), Zr (8Zr)] is presented.
متن کاملIron Catalyzed Dehydrocoupling of Amine‐ and Phosphine‐Boranes
Catalytic dehydrocoupling methodologies, whereby dihydrogen is released from a substrate (or intermolecularly from two substrates) is a mild and efficient method to construct main group element-main group element bonds, the products of which can be used in advanced materials, and also for the development of hydrogen storage materials. With growing interest in the potential of compounds such as ...
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ورودعنوان ژورنال:
- Chemical communications
دوره 34 شماره
صفحات -
تاریخ انتشار 2007