Synthesis, Structure, and Reactivity of (tBu2PC2H4PtBu2)Ni(CH3)2 and {(tBu2PC2H4PtBu2)Ni}2(μ-H)2
摘要:
Oxidative addition of CH3I to (d(t)bpe)Ni(C2H4) (d(t)bpe = (Bu2PC2H4PBu2)-Bu-t-Bu-t) affords (d(t)bpe)-Ni(I)CH3 (I). The reaction of (d(t)bpe)NiCl2 or 1 with the stoichiometric quantity of (tmeda)Mg(CH3), yields (d(t)bpe)Ni(CH3)(2) (2). (d(t)bpe)Ni(I)CD3 (1-d(3)) and (d(t)bpe)Ni(CD3)(2) (2-d(6)) have been prepared analogously. Thermolysis of 2 in benzene affords {(d(t)bpe)Ni}(2)(mu-eta(2):eta(2)-C6H6) (4). The reaction of either 2 or 4 with hydrogen (H-2, HD, D-2) gives {(d(t)bpe)Ni}(2)(mu-H)(2) (3) and the isotopomers {(d(t)bpe)Ni}(2)(mu-H)(mu-D) (3-d) and {(d(t)bpe)Ni}(2)(mu-D)(2) (3-d(2)). According to the NMR spectra, the structure of 3 is dynamic in solution. The crystal structures of 2 and 3 have been determined by X-ray crystallography, Solution thermolysis of 2 or reduction of (dtbpe)NiCl2 with Mg* in the presence of alkanes probably involves a-complex-type intermediates [(d(t)bpe)Ni(eta(2)-R'H)] (R' = e.g. C2H5, A). While the nonisolated [(d(t)bpe)Ni-0] a-complexes A are exceedingly reactive intermediates, isolated 3 and 4 represent easy to handle starting complexes for [(d(t)bpe)Ni-0] reactions. Partial protolysis of 2 with CF3SO3H affords (d(t)bpe)Ni(CH3)(OSO2CF3) (5). Complex 5 reacts slowly with 2 equiv of ethene to give equimolar amounts of [(d(t)bpe)Ni(C2H5)](+)(OSO2CF3-) (6) and propene. The reaction is thought to be initiated by an insertion of ethene into the Ni-CH3 bond of 5 to form the intermediate [(d(t)bpe)Ni(C3H7)(OSO2CF3)] (G), followed by elimination of propene to give the hydride intermediate [(d(t)bpe)Ni(H)(OSO2CF3)] (H), which on insertion of ethene into the Ni-H bond affords 6.
Preparation of a,B-Ethylenically Unsaturated Carboxylic Salts By Catalytic Carboxylation Of Alkenes
申请人:BASF SE
公开号:US20130172616A1
公开(公告)日:2013-07-04
In a process for preparing an alkali metal or alkaline earth metal salt of an α,β-ethylenically unsaturated carboxylic acid, a) a transition metal-alkene complex is reacted with CO
2
to give a metallalactone, b) the metallalactone is reacted with a base to give an adduct of the alkali metal or alkaline earth metal salt of the α,β-ethylenically unsaturated carboxylic acid with the transition metal complex, and c) the adduct is reacted with an alkene to release the alkali metal or alkaline earth metal salt of the α,β-ethylenically unsaturated carboxylic acid and regenerate the transition metal-alkene complex. The base is selected from alkali metal or alkaline earth metal hydroxides and alkali metal or alkaline earth metal superbases. The alkene is, for example, ethene. The transition metal complex comprises, for example, nickel and a bidentate P,P, P,N, P,O or P,carbene ligand, such as 1,2-bis(di-tert-butylphosphino)ethane.
作者:Poerschke, Klaus-Richard、Pluta, Christian、Proft, Bernd、Lutz, Frank、Krueger, Carl
DOI:——
日期:——
Synthesis, Structure, and Reactivity of (<sup>t</sup>Bu<sub>2</sub>PC<sub>2</sub>H<sub>4</sub>P<sup>t</sup>Bu<sub>2</sub>)Ni(CH<sub>3</sub>)<sub>2</sub> and {(<sup>t</sup>Bu<sub>2</sub>PC<sub>2</sub>H<sub>4</sub>P<sup>t</sup>Bu<sub>2</sub>)Ni}<sub>2</sub>(μ-H)<sub>2</sub>
Oxidative addition of CH3I to (d(t)bpe)Ni(C2H4) (d(t)bpe = (Bu2PC2H4PBu2)-Bu-t-Bu-t) affords (d(t)bpe)-Ni(I)CH3 (I). The reaction of (d(t)bpe)NiCl2 or 1 with the stoichiometric quantity of (tmeda)Mg(CH3), yields (d(t)bpe)Ni(CH3)(2) (2). (d(t)bpe)Ni(I)CD3 (1-d(3)) and (d(t)bpe)Ni(CD3)(2) (2-d(6)) have been prepared analogously. Thermolysis of 2 in benzene affords (d(t)bpe)Ni}(2)(mu-eta(2):eta(2)-C6H6) (4). The reaction of either 2 or 4 with hydrogen (H-2, HD, D-2) gives (d(t)bpe)Ni}(2)(mu-H)(2) (3) and the isotopomers (d(t)bpe)Ni}(2)(mu-H)(mu-D) (3-d) and (d(t)bpe)Ni}(2)(mu-D)(2) (3-d(2)). According to the NMR spectra, the structure of 3 is dynamic in solution. The crystal structures of 2 and 3 have been determined by X-ray crystallography, Solution thermolysis of 2 or reduction of (dtbpe)NiCl2 with Mg* in the presence of alkanes probably involves a-complex-type intermediates [(d(t)bpe)Ni(eta(2)-R'H)] (R' = e.g. C2H5, A). While the nonisolated [(d(t)bpe)Ni-0] a-complexes A are exceedingly reactive intermediates, isolated 3 and 4 represent easy to handle starting complexes for [(d(t)bpe)Ni-0] reactions. Partial protolysis of 2 with CF3SO3H affords (d(t)bpe)Ni(CH3)(OSO2CF3) (5). Complex 5 reacts slowly with 2 equiv of ethene to give equimolar amounts of [(d(t)bpe)Ni(C2H5)](+)(OSO2CF3-) (6) and propene. The reaction is thought to be initiated by an insertion of ethene into the Ni-CH3 bond of 5 to form the intermediate [(d(t)bpe)Ni(C3H7)(OSO2CF3)] (G), followed by elimination of propene to give the hydride intermediate [(d(t)bpe)Ni(H)(OSO2CF3)] (H), which on insertion of ethene into the Ni-H bond affords 6.
NMR study of the Ni complexes based on 1-alkyl-1,2-diphospholes
作者:S. A. Kondrashova、Yu. S. Ganushevich、S. V. Kharlamov、V. A. Milyukov、Sh. K. Latypov
DOI:10.1007/s11172-019-2395-5
日期:2019.2
The structures of the nickel complexesbased on 1-alkyl-1,2-diphospholes in a solution were determined using 1D/2D homo- and heterocorrelation NMR experiments. The η2 coordination mode at the P–P bond is observed in the complexes.