54631-95-7Relevant academic research and scientific papers
Alkyne hydrosilylation catalyzed by nickel complexes of N-heterocyclic carbenes
Chaulagain, Mani Raj,Mahandru, Gireesh M.,Montgomery, John
, p. 7560 - 7566 (2007/10/03)
The addition of triethylsilane, triphenylsilane, and triethoxysilane to a variety of alkynes is catalyzed by complexes derived from Ni(COD)2 and N-heterocyclic carbenes. A description of the reaction scope and potential mechanistic implications
Pair-Selective Coupling of Alkynes with Alkenes on Zirconocene Complex
Takahashi, Tamotsu,Xi, Zhenfeng,Rousset, Christophe J.,Suzuki, Noriyuki
, p. 1001 - 1004 (2007/10/02)
When ethylene and alkynes such as 4-octyne and diphenylacetylene were treated with Cp2ZrBu2, highly pair selective coupling products were formed in high yields.Similarly, styrene or trimethylvinylsilane also afforded cross coupling products with alkynes on zirconocene complex.
Organometallic compounds of Group III XLIV. Molecular hydrogen and aluminium hydride transfers mediated by nickel(0) complexes: the intermediacy of nickel hydrides in the Ziegler nickel effect
Eisch, John J.,Sexsmith, Stephen R.,Fichter, Kenneth C.
, p. 273 - 293 (2007/10/02)
In investigating the possible mechanistic similarity between dihydrogen and aluminium hydride transfers to unsaturated hydrocarbons, the catalytic action of nickel(0) complexes on such transfers was investigated in detail.For dihydrogen transfers the tendency of dihydroaromatics to disproportionate into tetrahydroaromatic and aromatic hydrocarbons was evaluated for 1,2- and 1,4-dihydrobenzenes, 1,2- and 1,4-dihydronaphthalenes and 9,10-dihydroanthracene toward (Cod)2Ni, Bpy(Cod)Ni and (Et3P)4Ni.The catalyzed disproportionation, which proceeded with decreasing rate in the order, 1,4-C6H8 > 1,2-C6H8 > 1,2- and 1,4-C10H10 >> 9,10-C14H12, was interpreted in terms of the formation of intermediate allylic nickel hydrides.The study of aluminum hydride transfer to unsaturated hydrocarbons was carried out by letting organoaluminum alkyls or hydrides interact with nickel(0) complexes.Three different reactions were observed: (1) nickel-catalyzed olefin formation from R3Al; (2) nickel-catalyzed hydroaluminum from R2AlH and unsaturated hydrocarbons; and (3) stoichiometric reaction of nickel(0) compounds and LiAlH4 or R2AlH to from aluminum nickelides (LiAlH2Ni).The rates, stereochemistry, regiochemistry and deactivation of the thermal and nickel-catalyzed hydroaluminations of alkenes and alkynes were compared, in order to learn about the most probable catalytic carriers in such nickel catalysis.The foregoing lines of evidence on how nickel(0) interacts with organoaluminum compounds are brought together in formulating a new, comprehensive mechanism for the Ziegler Nickel Effect.In this novel molecular view, the catalytic carriers in the Nickel Effect are dialkylaluminum nickel hydrides.Seen in this light, dihydrogen and aluminum hydrogen transfers have more than just a formal similarity; both processes proceed by nickel hydrides, which are formed by way of oxidative insertions, into a C-H and an Al-H bond, respectively.
Unsymmetrically substituted hafnacyclopentadiene compounds: synthesis and structure
Sabade, Milimd B.,Farona, Michael F.,Zarate, Eugene A.,Youmgs, Wiley J.
, p. 347 - 356 (2007/10/02)
Hafnocene dichloride was reduced with amalgamated magnesium in the presence of asymmetric alkynes to give high yields of the corresponding bis(cyclopentadienyl)hafnacyclopentadiene compounds.An X-ray crystal structure has been performed on bis(η5-cyclopentadienyl)-2,5-bis(trimethylsilyl)-3,4-dimethylhafnacyclopentadiene crystallized in the triclinic space group P1 in a unit cell of dimensions a 9.067(3), b 10.421(3), c 12.296(4) Angstroem, α 100.13(2), β 87.52(2), γ 105.07(2) deg and V 1170.1(6) Angstroem3.The final agreement indices for 4719 reflections having F02>/=0 are R(F)=0.047.
Synthesis of Substituted 1,3-Dienes by the Reaction of Alkenylsulfonyl Chlorides with Olefins Catalyzed by a Ruthenium(II) Complex
Kameyama, Masayuki,Shimezawa, Hiroshi,Satoh, Takeshi,Kamigata, Nobumasa
, p. 1231 - 1236 (2007/10/02)
Alkenylsulfonyl chlorides reacted with vinylarenes in the presence of a catalytic amount of dichlorotris(triphenylphosphine)ruthenium(II) to give substituted adducts, which were dehydrochlorinated and desulfonylated successively to form substituted (E,E)-1,3-dienes in good yield.
Obtention et isomerisation du diphenyl-1,4 diformyl-2,3 butadiene (Z,Z)
Wehbe, Mohamed,Peyrot, Martial,Lepage, Lucette,Lepage, Yves
, p. 321 - 322 (2007/10/02)
We report the synthesis of (Z,Z) 1,4-diphenyl-2,3-diformylbutadiene, a useful synthon: the dialdehyde 5 is prepared from hydrocarbon 1, via the new compounds 2, 3 and the diol 4a as intermediates.Hydrocarbon 1 gives, with selenium dioxide, the known selen
