999-97-3Relevant articles and documents
-
Wannagat,U. et al.
, p. 373 - 384 (1970)
-
The Instability of Ni{N(SiMe3)2}2: A Fifty Year Old Transition Metal Silylamide Mystery
Faust, Michelle,Bryan, Aimee M.,Mansikkam?ki, Akseli,Vasko, Petra,Olmstead, Marilyn M.,Tuononen, Heikki M.,Grandjean, Fernande,Long, Gary J.,Power, Philip P.
, p. 12914 - 12917 (2015)
The characterization of the unstable NiII bis(silylamide) Ni{N(SiMe3)2}2 (1), its THF complex Ni{N(SiMe3)2}2(THF) (2), and the stable bis(pyridine) derivative trans-Ni{N(SiMe3)2}2(py)2 (3), is described. Both 1 and 2 decompose at ca. 25°C to a tetrameric NiI species, [Ni{N(SiMe3)2}]4 (4), also obtainable from LiN(SiMe3)2 and NiCl2(DME). Experimental and computational data indicate that the instability of 1 is likely due to ease of reduction of NiII to NiI and the stabilization of 4 through dispersion forces.
Isolation and Reactivity Study of a Model 17-Electron Species in the Oxo Process
Takebayashi, Satoshi,Fayzullin, Robert R.
supporting information, p. 500 - 507 (2021/02/05)
[Co(L)(CO)3]2 (L = CO or PR3) catalyzed hydroformylation of olefins is among the most successful homogeneous organometallic catalysis. The bimetallic [Co(L)(CO)3]2 complex exists in equilibrium with its mononuclear 17-electron [Co(L)(CO)3] metalloradical. However, isolation of the mononuclear metalloradical is unknown, and hence the role of this species in the catalytic cycle is difficult to study. Herein, we report the isolation of [Co(L)(CO)3] using ring-expanded N-heterocyclic carbene (reNHC) ligands. Isolation of this complex enabled us to examine feasibility of putative termolecular H2 activation by the [Co(L)(CO)3] metalloradicals. The kinetic experiments revealed that [Co(reNHC)(CO)3] does not activate H2 via a previously proposed termolecular mechanism but via a bimolecular mechanism. The result obtained here will contribute to design a cobalt carbonyl complex that activates H2 under mild conditions and to develop a more energy efficient oxo process based on economical cobalt catalysts.
Preparation method of silazane
-
Paragraph 0020-0021, (2020/10/14)
The invention provides a preparation method of silazane. The preparation method comprises the following steps: carrying out a stirring reaction on monochlorosilane, alkali metal amide, a catalyst anda solvent in a reaction container completely; and after the reaction is finished, carrying out reduced pressure distillation to obtain the silazane. Compared with the prior art, the invention providesa new silazane synthesis technology, the process is simple, the yield is as high as 93.0%, and the purity can reach 93.6%.