1016983-72-4Relevant academic research and scientific papers
Extreme π-Loading as a Design Element for Accessing Imido Ligand Reactivity. A CCC-NHC Pincer Tantalum Bis(imido) Complex: Synthesis, Characterization, and Catalytic Oxidative Amination of Alkenes
Helgert, Theodore R.,Zhang, Xiaofei,Box, Hannah K.,Denny, Jason A.,Valle, Henry U.,Oliver, Allen G.,Akurathi, Gopalakrishna,Webster, Charles Edwin,Hollis, T. Keith
, p. 3452 - 3460 (2016)
A rare Ta bis(imido) complex, which has unique reactivity, was prepared by manipulating the coordination sphere of a CCC-NHC pincer Ta complex. The reaction of lithium tert-butylamide with complex 1 yielded (1,3-bis(3′-butylimidazol-2′-yl-1′-idene)-2-phenylene)bis(tert-butylimido)tantalum(V) (2) as a lithium iodide bridged dimer, as determined by the X-ray structure. Complex 2 catalytically cyclized α,ω-aminoalkenes to effect an oxidative amination of alkenes (dehydrogenation by C-H activation) and produced a cyclic imine, an equivalent of reduced substrate, and varying proportions of hydroamination. Various additives and concentration impact the catalytic results. Computational and experimental observations have led to an initial mechanistic hypothesis. Based upon it, precatalyst 2 appears to be the first example of a bifunctional catalyst (MH-NHR) that is highly selective for nonpolar C=C bonds in preference to polar C=X bonds for outer-sphere hydrogenation.
CCC-N-heterocyclic carbene pincer complexes: Synthesis, characterization and hydroamination activity of a hafnium complex
Cho, Joon,Hollis, T. Keith,Valente, Edward J.,Trate, Jaclyn M.
, p. 373 - 377 (2011)
Our methodology for the stoichiometric preparation of CCC-NHC pincer complexes of Zr has been extended to Hf. The CCCBu-NHC pincer Hf complex has been characterized by X-ray crystal structure analysis. Catalytic activity in the intramolecular h
Cyclopentadienyl-bis(oxazoline) Magnesium and Zirconium Complexes in Aminoalkene Hydroaminations
Eedugurala, Naresh,Hovey, Megan,Ho, Hung-An,Jana, Barun,Lampland, Nicole L.,Ellern, Arkady,Sadow, Aaron D.
, p. 5566 - 5575 (2015)
A new class of cyclopentadiene-bis(oxazoline) compounds and their piano-stool-type organometallic complexes have been prepared as catalysts for hydroamination of aminoalkenes. The two compounds MeC(OxMe2)2C5H5 (
Metal-Organic Framework Nodes Support Single-Site Magnesium-Alkyl Catalysts for Hydroboration and Hydroamination Reactions
Manna, Kuntal,Ji, Pengfei,Greene, Francis X.,Lin, Wenbin
, p. 7488 - 7491 (2016)
Here we present the first example of a single-site main group catalyst stabilized by a metal-organic framework (MOF) for organic transformations. The straightforward metalation of the secondary building units of a Zr-MOF with Me2Mg affords a hi
Metal and halogen dependence of the rate effect in hydroamination/ cyclization of unactivated aminoalkenes: Synthesis, characterization, and catalytic rates of CCC-NHC hafnium and zirconium pincer complexes
Clark, Wesley D.,Cho, Joon,Valle, Henry U.,Hollis, T. Keith,Valente, Edward J.
, p. 534 - 540 (2014)
1,3-Bis(3′-butylimidazol-1′-yl)benzene dibromide (2b) or 1,3-bis(3′-butylimidazol-1′-yl)benzene dichloride (2c) was reacted with a stoichiometric amount of Zr(NMe2)4 or Hf(NMe 2)4 yielding four new early transit
Zirconium complexes supported by imidazolones: Synthesis, characterization, and application of precatalysts for the hydroamination of aminoalkenes
Hu, Yu-Cheng,Liang, Cheng-Feng,Tsai, Jie-Hong,Yap, Glenn P. A.,Chang, Ya-Ting,Ong, Tiow-Gan
experimental part, p. 3357 - 3361 (2010/10/04)
Dimeric zirconium benzyl and amide complexes supported by an imidazolone framework have been successfully synthesized and fully characterized. The amide complexes were found to be effective catalysts for intramolecular hydroamination of primary and second
An improved method for the synthesis of zirconium (CCC-N-heterocyclic carbene) pincer complexes and applications in hydroamination
Cho, Joon,Hollis, T. Keith,Helgert, Theodore R.,Valente, Edward J.
scheme or table, p. 5001 - 5003 (2009/06/05)
Upon heating Zr(NMe2)4, 1,3-bis(N-butyl-imidazolium) benzene diiodide and toluene analytically pure Zr pincer complex was obtained, which was found to be an intramolecular hydroamination catalyst. The Royal Society of Chemistry.
