69239-97-0Relevant articles and documents
Ni-O Cooperation versus Nickel(II) Hydride in Catalytic Hydroboration of N-Heteroarenes
Liu, Jianguo,Chen, Jia-Yi,Jia, Mengjing,Ming, Bangrong,Jia, Jiong,Liao, Rong-Zhen,Tung, Chen-Ho,Wang, Wenguang
, p. 3849 - 3857 (2019/05/14)
An air-stable half-sandwich nickel(II) complex bearing a phosphinophenolato ligand, Cp?Ni(1,2-Ph2PC6H4O) (1), has been designed and synthesized for activation of HBpin and catalytic hydroboration of N-heteroarenes such as
Structural characterisation of cationic methylallyl, methylindenyl and pentamethylcyclopentadienyl nickel complexes containing the bulky phosphine 1,2-bis(diisopropylphosphino)ethane
Tenorio, Manuel Jimenez,Puerta, M. Carmen,Salcedo, Isabel,Valegra, Pedro
, (2008/10/08)
A novel high-yield, convenient synthetic method for the complex [Ni(COD)2] has been developed based upon the use of dibutylmagnesium as reducing agent. The cationic complexes [Ni(η3CH2C(R)CH2)(dippe)][BPh4] (R = Me la or H 1b; dippe = Pr2iPCH2CH2PPr2i ) were obtained by reaction of [Ni(COD)2] with BrCH2C(R)=CH2 in diethyl ether, followed by treatment with dippe and NaBPh4 in methanol. [Ni(2-MeInd)(dippe)][BPh4] 2 (2-MeInd = 2-methylindenyl) and [Ni(C5Me5)(dippe)][BPh4] 3 were respectively prepared by reaction of either [Ni(2-MeInd)Br(PPh3] or [Ni(C5Me5)Br(PPh3)] with dippe and NaBPh4 in methanol. The crystal structures of 1a, 2 and 3 were determined. All of the compounds show pseudo-square planar two legged piano stool structures. The methylallyl ligand in la shows η3 coordination as expected, whereas in 2 the occurrence of an allyl-ene distortion in the 2-methylindenyl ligand leads to an intermediate η3η5 coordination mode. An intermediate allyl-ene/diene distortion is present in the C5Me5 ligand in 3, although in this case a symmetrical η5 coordination is observed. All compounds were also characterised in solution by NMR spectroscopy.
Synthesis and reactions of nickel and palladium carbon-bound enolate complexes
Burkhardt, Elizabeth R.,Bergman, Robert G.,Heathcock, Clayton H.
, p. 30 - 44 (2008/10/08)
Nickel and palladium carbon-bound enolates of the general formula η5-C5R5(Ph 3P)MCHR′COR″ (R = H, CH3; R′ = H, CH3; R″ = t-Bu, Ph, O-t-Bu) were prepared. Cp*(Ph3P)NiCH2CO2-t-Bu (1e) was characterized by X-ray diffraction. Compound 1e crystallizes in the monoclinic space group P21/n with unit-cell dimensions a = 13.6110 (20) A?, b = 12.7454 (13) A?, c = 17.8571 (23) A?, β = 105.544 (11)°, Z = 4, observed data 4091, R = 4.53%, and Rw = 4.19%. Reactions of these nickel and palladium enolates with aldehydes and other electrophilic reagents were examined. The nickel ketone enolates were shown to react with 2 equiv of benzaldehyde to deliver products resulting from a Tischtschenko-type oxidation/reduction process. Cp(Ph3P)NiCH2CO-t-Bu reacts with phosphines (L) to yield paramagnetic nickel(I) complexes of general formula Cp(L)2Ni.
PENTAMETHYLCYCLOPENTADIENYL-UEBERGANGSMETALL-KOMPLEXE X. HALBSANDWICHKOMPLEXE DES Fe UND Ni ALS REAKTIVE ZWISCHENPRODUKTE
Koelle, U.,Fuss, B.,Khouzami, F.,Gersdorf, J.
, p. 77 - 84 (2007/10/02)
Reaction of NiX2*DME (X=Cl, Br; DME=1,2-Diemthyoxyethane) with Cp'Li (Cp'-η5-C5Me5) in THF at -10 deg C yields as intermediates dimeric halogeno complexes 2 (1) as shown by mass spectroscopy. 1 reacts with neutral and anionic donor lig
