A geminal dithallated bis(iminodiphenylphosphorano)methine carbon bridged dimer bound by Tl–Tl interactions

2010 ◽  
Vol 46 (29) ◽  
pp. 5370 ◽  
Author(s):  
Guibin Ma ◽  
Michael J. Ferguson ◽  
Ronald G. Cavell
Keyword(s):  
Methine Carbon

scholarly journals Pentad Assignments of Methine Carbon Resonances in Stereoregular Ethylene–Propylene Copolymer Based on Two-Dimensional INADEQUATE NMR Spectrum

1988 ◽  
Vol 20 (10) ◽  
pp. 895-902 ◽  
Author(s):  
Tetsuo Hayashi ◽  
Yoshio Inoue ◽  
Riichirô Chûjô ◽  
Tetsuo Asakura
Keyword(s):  
Two Dimensional ◽  
Nmr Spectrum ◽  
Methine Carbon ◽  
Ethylene Propylene

Functionalized bis(pyrazol-1-yl)methanes by organotin halide on the methine carbon atom and their related reactions

2008 ◽  
Vol 693 (7) ◽  
pp. 1359-1366 ◽  
Author(s):  
Zhen-Kang Wen ◽  
Yun-Fu Xie ◽  
Shu-Bin Zhao ◽  
Run-Yu Tan ◽  
Liang-Fu Tang
Keyword(s):  
Carbon Atom ◽  
Methine Carbon

The chemistry of pyrrolic compounds. LV. 13C chemical shift data for the isomeric protoporphyrins

1984 ◽  
Vol 37 (2) ◽  
pp. 335 ◽  
Author(s):  
RJ Abraham ◽  
PS Clezy ◽  
Lv Thuc
Keyword(s):  
Chemical Shift ◽  
Side Chain ◽  
Methine Carbon ◽  
Chemical Shift Data ◽  
13C Chemical Shift ◽  
Derivatives Of ◽  
Shift Data

The 13C n.m.r, spectra of the 15 isomeric protoporphyrin dimethyl esters have been determined. Measurements were made on the zinc chelate derivatives of the porphyrins in the presence of pyrrolidine and assignments are given for the side chain and methine carbon atoms.

Reactivity of bis(pyrazol-1-yl)methanes functionalized by 2-hydroxyphenyl and 2-methoxyphenyl on the methine carbon atom with W(CO)5THF

2011 ◽  
Vol 696 (23) ◽  
pp. 3662-3667 ◽  
Author(s):  
Ke Ding ◽  
Cai-Hong Cheng ◽  
Yan-Xin Yang ◽  
Hai-Bin Song ◽  
Liang-Fu Tang
Keyword(s):  
Carbon Atom ◽  
Methine Carbon

Towards the functionalization of the methine carbon of a sterically hindered tris(pyrazolyl)methane: is a radical pathway envisageable? Synthesis and structure of tetrakis(3,5-dimethylpyrazolyl)methane

Tetrahedron ◽  
2009 ◽  
Vol 65 (45) ◽  
pp. 9218-9223 ◽  
Author(s):  
Laurent Benisvy ◽  
Riccardo Wanke ◽  
Maxim L. Kuznetsov ◽  
M. Fátima C. Guedes da Silva ◽  
Armando J.L. Pombeiro
Keyword(s):  
Methine Carbon ◽  
Sterically Hindered

scholarly journals The Synthesis of Novel Gallium Carbenes, Nitrenes, Phosphinidenes and Alkoxides

2021 ◽  
Author(s):  
◽  
Struan John Wright Cummins
Keyword(s):  
Amide Proton ◽  
Isopropyl Group ◽  
Multiple Bonds ◽  
Nmr Spectrum ◽  
Methine Carbon ◽  
H Nmr ◽  
Synthetic Strategy ◽  
Elimination Mechanism ◽  
Synthetic Routes ◽  
Gallium Complex

<p>In the present study, synthetic routes to formal double bonds between gallium and carbon (fig 1), nitrogen (fig 2), and phosphorus (fig 3) have been investigated. These synthetic routes utilised the monoanionic, four electron donor, β-diketiminate (BDI) ligand to provide both steric and electronic stabilisation to three coordinate gallium complexes. The known di-substituted β-diketiminatogallium complexes: [(BDI)GaMe₂] and [(BDI)Ga(NHPh)₂], as well the new complexes: [(BDI)GaBn₂], [(BDI)Ga(NHDMP)₂] (DMP = 2,6-Me₂C₆H₃), [(BDI)Ga(NHDIPP)₂] (DIPP = 2,6-iPr₂C₆H₃), [(BDI)Ga(PHPh)₂] were examined for their reactivity towards the α-proton elimination mechanism for the formation of multiple bonds that is observed in transition metals. All of these complexes were shown to be unreactive towards α-proton elimination.  The di-substituted β-diketiminato-gallium complex [(BDI)GaMe₂] was subjected to various aniline derivatives to investigate if the methyl ligands exhibited the same reactivity as di-methyl transition metal complexes, where the methyl ligands could deprotonate the aniline to form a metal-imido complex. This complex was found to have no reactivity with anilines.  The mono-substituted β-diketiminato-gallium complex [(BDI)Ga(NHDMP)Cl] was tested for its reactivity with ⁿBuLi to abstract the amide proton and eliminate LiCl to form a gallium imido complex. While the ¹H NMR spectrum of the reaction mixture showed that a reaction had occurred, the products could not be isolated for characterisation.  Another mono-substituted β-diketiminato-gallium complex [(BDI)Ga(PHPh)Cl] was also tested for its reactivity with ⁿBuLi to abstract the phosphide proton and eliminate LiCl to form a gallium phosphinidene complex. The ¹H NMR spectrum and ³¹P NMR spectrum of the isolated complex revealed that it still contained a phosphide proton, however the gallium centre now appeared to be bonded to a former methine carbon of an isopropyl group of the BDI ligand (fig 32). This bond may have formed through metathesis between an intermediate containing a gallium-phosphorus double bond, and the C-H bond of the isopropyl group. Further mechanistic studies could confirm if an intermediate such as [fig 3] is formed, and the synthetic strategy altered to isolate it.  The synthesis of β-diketiminato-gallium-alkoxide complexes was also attempted, however the products of these synthesises could not be isolated due to solubility issues, potentially due to polymerisation.</p>

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