Titanium complex bearing 8-anilino-1-naphthalenesulfonate ligand: Synthesis and catalytic behavior toward ethylene (co-)polymerization

2012 ◽  
Vol 127 (2) ◽  
pp. 1403-1408
Author(s):  
Hao Zhang ◽  
He-Xin Zhang ◽  
Xiao-Ping Cai ◽  
Xue-Quan Zhang
Keyword(s):  
Catalytic Behavior ◽  
Titanium Complex ◽  
Ligand Synthesis

Bio-inspired Mn-catalysts immobilized on silica surface: The influence of the ligand synthesis on catalytic behavior

2018 ◽  
Vol 108 ◽  
pp. 33-40 ◽  
Author(s):  
M. Papastergiou ◽  
Ag. Stamatis ◽  
A. Simaioforidou ◽  
M. Louloudi
Keyword(s):  
Silica Surface ◽  
Catalytic Behavior ◽  
Ligand Synthesis

Reversible Oxidative-Addition and Reductive-Elimination of Thiophene from a Titanium Complex and Its Thermally-Induced Hydrodesulfurization Chemistry

2019 ◽  
Author(s):  
Alejandra Gomez-Torres ◽  
J. Rolando Aguilar-Calderón ◽  
Carlos Saucedo ◽  
Aldo Jordan ◽  
Alejandro J. Metta-Magaña ◽  
...  
Keyword(s):  
Dft Calculations ◽  
Ring Opening ◽  
Thiophene Ring ◽  
Oxidative Addition ◽  
Reductive Elimination ◽  
Thermally Induced ◽  
Titanium Complex

<p>The masked Ti(II) synthon (<sup>Ket</sup>guan)(<i>η</i><sup>6</sup>-Im<sup>Dipp</sup>N)Ti (<b>1</b>) oxidatively adds across thiophene to give ring-opened (<sup>Ket</sup>guan)(Im<sup>Dipp</sup>N)Ti[<i>κ</i><sup>2</sup>-<i>S</i>(CH)<sub>3</sub><i>C</i>H] (<b>2</b>). Complex <b>2</b> is photosensitive, and upon exposure to light, reductively eliminates thiophene to regenerate <b>1</b> – a rare example of early-metal mediated oxidative-addition/reductive-elimination chemistry. DFT calculations indicate strong titanium π-backdonation to the thiophene π*-orbitals leads to the observed thiophene ring opening across titanium, while a proposed photoinduced LMCT promotes the reverse thiophene elimination from <b>2</b>. Finally, pressurizing solutions of <b>2 </b>with H<sub>2</sub> (150 psi) at 80 °C leads to the hydrodesulfurization of thiophene to give the Ti(IV) sulfide (<sup>Ket</sup>guan)(Im<sup>Dipp</sup>N)Ti(S) (<b>3</b>) and butane. </p>

The synthesis and structure of silica-supported bis(h5-cyclopentadienyl)dichlorotitanium(IV) complexes

1986 ◽  
Vol 51 (7) ◽  
pp. 1430-1438 ◽  
Author(s):  
Alena Reissová ◽  
Zdeněk Bastl ◽  
Martin Čapka
Keyword(s):  
Free Surface ◽  
Hydroxyl Groups ◽  
Titanium Complex ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups ◽  
Free Hydroxyl ◽  
Cyclopentadienyl Anion

The title complexes have been obtained by functionalization of silica with cyclopentadienylsilanes of the type Rx(CH3)3 - xSi(CH2)nC5H5 (x = 1-3, n = 0, 1, 3), trimethylsilylation of free surface hydroxyl groups, transformation of the bonded cyclopentadienyl group to the cyclopentadienyl anion, followed by coordination of (h5-cyclopentadienyl)trichlorotitanium. The effects of single steps of the above immobilization on texture of the support, the number of free hydroxyl groups, the coverage of the surface by cyclopentadienyl groups and the degree of their utilization in anchoring the titanium complex have been investigated. ESCA study has shown that the above anchoring leads to formation of the silica-supported bis(h5-cyclopentadienyl)dichlorotitanium(IV) complex.

A side-on Mn(iii)–peroxo supported by a non-heme pentadentate N3Py2 ligand: synthesis, characterization and reactivity studies

2021 ◽  
Author(s):  
Dattaprasad D. Narulkar ◽  
Azaj Ansari ◽  
Anil Kumar Vardhaman ◽  
Sarvesh S. Harmalkar ◽  
Giribabu Lingamallu ◽  
...  
Keyword(s):  
Nucleophilic Reactivity ◽  
Ligand Synthesis ◽  
Aldehyde Oxidation

A new non-heme Mn(iii)–peroxo (1a) has been generated, characterized and reactivity is in aldehyde deformylation reaction. A nucleophilic reactivity of 1a in aldehyde oxidation is proposed.

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