ChemInform Abstract: Parallelism in the Mechanisms of the One-Electron Oxidative Additions of ortho- and para-Quinones to Co(CN)53- (EPR- und elektronenspektroskopische Untersuchungen der Reaktion von [Co(CN)5]3- mit p-Benzochinon oder 3,5-Di-tert.-butyl-

1983 ◽  
Vol 14 (22) ◽  
Author(s):  
A. JUN. VLCEK ◽  
J. KLIMA ◽  
A. A. VLCEK
Keyword(s):  
Tert Butyl ◽  
Oxidative Additions ◽  
The One

Thermodynamic studies in solution. Part IV. Solvent effect on the solvolysis of tert-butyl chloride. A new treatment of the experimental data

1979 ◽  
Vol 57 (5) ◽  
pp. 500-502 ◽  
Author(s):  
Joaquim Jose Moura Ramos ◽  
Jacques Reisse ◽  
M. H. Abraham
Keyword(s):  
Free Energy ◽  
Solvent Effect ◽  
Free Energies ◽  
Butyl Chloride ◽  
Activation Free Energy ◽  
Tert Butyl ◽  
New Treatment ◽  
The One ◽  
Activated Complex ◽  
Tert Butyl Chloride

A new treatment of the solvent effect on the solvolysis of tert-butyl chloride is proposed. This treatment is based on activation free energy measurements and on transfer free energy measurements of the reactant (R) on the one hand and of a model (M) of the activated complex (AC) on the other hand. Solute–solvent interaction free energies for the reactant, the activated complex and the model compound are estimated. This estimation involves the calculation of the free energy of cavity formation of these various solutes (R, AC, and M) in all the solvents. These cavity terms, which are a function of the cohesive properties of the solvent and of the surface of the cavity do not reflect the electronic structure of the solute whereas the interaction free energy term does. The method we propose can be described as a new 'experimental' approach for the study of the charge separation in an activated complex.

scholarly journals Redox-Modulations of Photophysical and Single-molecule Magnet Properties in Ytterbium Complexes Involving Extended-TTF Triads

Molecules ◽  
2020 ◽  
Vol 25 (3) ◽  
pp. 492 ◽  
Author(s):  
Bertrand Lefeuvre ◽  
Jessica Flores Gonzalez ◽  
Frédéric Gendron ◽  
Vincent Dorcet ◽  
François Riobé ◽  
...  
Keyword(s):  
Single Molecule ◽  
Electronic Absorption Spectra ◽  
Chemical Oxidation ◽  
X Ray Diffraction ◽  
Single Molecule Magnets ◽  
Absorption Properties ◽  
Tert Butyl ◽  
Ytterbium Complexes ◽  
The One ◽  
Dinuclear Compounds

The reaction between the 2,2’-benzene-1,4-diylbis(6-hydroxy-4,7-di-tert-butyl-1,3-benzodithiol-2-ylium-5-olate triad (H2SQ) and the metallo-precursor [Yb(hfac)3]⋅2H2O led to the formation of a dinuclear coordination complex of formula [Yb2(hfac)6(H2SQ)]⋅0.5CH2Cl2 (H2SQ-Yb). After chemical oxidation of H2SQ in 2,2’-cyclohexa-2,5-diene-1,4-diylidenebis(4,7-di-tert-butyl-1,3-benzodithiole-5,6-dione (Q), the latter triad reacted with the [Yb(hfac)3]⋅2H2O precursor to give the dinuclear complex of formula [Yb2(hfac)6(Q)] (Q-Yb). Both dinuclear compounds have been characterized by X-ray diffraction, DFT optimized structure and electronic absorption spectra. They behaved as field-induced Single-Molecule Magnets (SMMs) nevertheless the chemical oxidation of the semiquinone to quinone moieties accelerated by a factor of five the relaxation time of the magnetization of Q-Yb compared to the one for H2SQ-Yb. The H2SQ triad efficiently sensitized the YbIII luminescence while the chemical oxidation of H2SQ into Q induced strong modification of the absorption properties and thus a quenching of the YbIII luminescence for Q-Yb. In other words, both magnetic modulation and luminescence quenching are reached by the oxidation of the protonated semiquinone into quinone.

Application of the Octacarbonyldicobalt-Catalyzed Carbonylation of Ethyl Diazoacetate for the One-Pot Synthesis of N-tert-Butyl-trans-α-ethoxycarbonyl-β-phenyl-β-lactam

2009 ◽  
Vol 2009 (12) ◽  
pp. 1994-2002 ◽  
Author(s):  
Eszter Fördős ◽  
Róbert Tuba ◽  
László Párkányi ◽  
Tamás Kégl ◽  
Ferenc Ungváry
Keyword(s):  
One Pot ◽  
Ethyl Diazoacetate ◽  
Tert Butyl ◽  
One Pot Synthesis ◽  
The One

Redox behavior of novel nickel and palladium complexes supported by trianionic non-innocent ligand containing β-diketiminate and phenol groups

2015 ◽  
Vol 19 (01-03) ◽  
pp. 377-387 ◽  
Author(s):  
Yuma Morimoto ◽  
June Takaichi ◽  
Shinichi Hanada ◽  
Kei Ohkubo ◽  
Hideki Sugimoto ◽  
...  
Keyword(s):  
Palladium Complex ◽  
Protonated Form ◽  
Palladium Complexes ◽  
Dalton Trans ◽  
Tert Butyl ◽  
Redox Active ◽  
Amino Phenol ◽  
New Type ◽  
The One ◽  
Nickel And Palladium Complexes

A new type of nickel and palladium complexes with non-innocent β-diketiminate ligand having redox active phenol groups, 2,4-di-tert-butyl-6-(((1E,2E)-3-((3,5-di-tert-butyl-2-hydroxyphenyl)amino)-2-nitroallylidene)amino)phenol ( L H 3, fully protonated form) have been developed, and the structure, physical properties, and reactivity of their one-electron and two-electron oxidized complexes, [MII(L•2-)] and [MII(L-)]+ ( M = Ni II or Pd II ) have been examined in detail. The two-electron oxidized forms of both complexes, [MII(L-)]+, exhibited hydrogen atom abstraction ability from 1,4-cyclohexadiene (CHD) comparable to its copper analog [ Cu II ( L -)]+ (Dalton Trans. 2013; 42: 2438-2444). The one-electron oxidized form of palladium complex, [ Pd II ( L •2-)], was also found to oxidize CHD, whereas the nickel analog, [ Ni II ( L •2-)], exhibited photo-induced oxidation ability of CHD.

Influence des groupes tert-butyle, triméthylsilyle et triméthylgermyle sur la stéréochimie de réactions d'addition en série cyclohexénique. I. Synthèse des alcènes et hydroboration

1974 ◽  
Vol 52 (24) ◽  
pp. 4133-4138 ◽  
Author(s):  
Christian Freppel ◽  
Marc-André Poirier ◽  
Jean-Claude Richer ◽  
Yvette Maroni ◽  
Georges Manuel
Keyword(s):  
The Other ◽  
Electronic Effects ◽  
Tert Butyl ◽  
The One ◽  
Steric Influence

Syntheses of 1-tert-butyl-(1a), 1-trimethylsilyl-(1b) and 1-trimethylgermanyl-4,4-dimethylcyclohexene (1c) are described as are those of 6-tert-butyl- (2a), 6-trimethylsilyl- (2b) and 6-trimethylgermanyl-3,3-dimethylcyclohexene (2c). The stereochemistry of the hydroboration of these alkenes is examined. The stereochemistry is governed, on the one hand, by the steric influence of the various substituents and on the other by the steric and electronic effects of the trimethylsilyl and trimethylgermanyl groups. [Journal translation]

Vapour-liquid equilibrium in the methyl tert-butyl ether-n-hexane and methyl tert-butyl ether-toluene systems

1979 ◽  
Vol 44 (12) ◽  
pp. 3627-3631 ◽  
Author(s):  
Jiří Plura ◽  
Jaroslav Matouš ◽  
Josef P. Novák ◽  
Josef Šobr
Keyword(s):  
Methyl Tert Butyl Ether ◽  
Liquid Equilibrium ◽  
Butyl Ether ◽  
Tert Butyl ◽  
Equilibrium Data ◽  
The One ◽  
Kister Equation

Vapour-liquid equilibrium data in binary methyl tert-butyl ether-n-hexane and methyl tert-butyl ether-toluene mixtures were determined experimentally. The data were described thermodynamically by the one-constant Redlich-Kister equation.

Synthesis and reactivity of the stable silylene N,N'-di-tert-butyl-1,3-diaza-2-sila-2-ylidene

2000 ◽  
Vol 78 (11) ◽  
pp. 1526-1533 ◽  
Author(s):  
Michael Haaf ◽  
Thomas A Schmedake ◽  
Bryan J Paradise ◽  
Robert West
Keyword(s):  
Solid State ◽  
Alkali Metals ◽  
The Novel ◽  
Concentrated Solutions ◽  
Tert Butyl ◽  
Proton Source ◽  
The One ◽  
Stable Silylene

The synthesis and several reactions of the stable silylene 1 (N,N'-di-tert-butyl-1,3-diaza-2-sila-2-ylidene) are reported. Overreduction of 1 with alkali metals results in the formation of a dimeric dianion, which can be trapped with a proton source to give the dihydride derivative 9. In the solid state or in concentrated solutions, 1 undergoes a reversible conversion into the novel tetrameric disilene, 10. 1 reacts with ethanol, phenol, and water via insertion into the O—H bond, and with iodomethane by insertion into the C—I bond. A reaction of 1 with the diene 2,3-dimethyl-1,3-butadiene affords the silacyclopentene, 15. This reaction is markedly different from the one found for the unsaturated analog of the silylene, 2, which catalyzes the conversion of this diene into a highly cross-linked polymer.Key words: silylene, carbene analog, disilene, divalent compounds, N-heterocycles.

scholarly journals 3-(tert-Butyl)-N-(4-methoxybenzyl)-1-methyl-1H-pyrazol-5-amine

Molbank ◽  
10.3390/m1196 ◽  
2021 ◽  
Vol 2021 (1) ◽  
pp. M1196
Author(s):  
Diana Becerra ◽  
Hugo Rojas ◽  
Juan-Carlos Castillo
Keyword(s):  
Reductive Amination ◽  
2D Nmr ◽  
Reduction Reaction ◽  
Reaction Sequence ◽  
One Pot ◽  
Isolation And Purification ◽  
Tert Butyl ◽  
The One ◽  
Synthetic Intermediate

We reported an efficient one-pot two-step synthesis of 3-(tert-butyl)-N-(4-methoxybenzyl)-1-methyl-1H-pyrazol-5-amine 3 in good yield by a solvent-free condensation/reduction reaction sequence starting from 3-(tert-butyl)-1-methyl-1H-pyrazol-5-amine 1 and p-methoxybenzaldehyde 2. The one-pot reductive amination proceeded by the formation in situ of the N-(5-pyrazolyl)imine 4 as key synthetic intermediate of other valuable pyrazole derivatives. This methodology is distinguished by its operational easiness, short reaction time, isolation and purification of the aldimine intermediate is not required. The structure of the synthesized N-heterocyclic amine 3 was fully characterized by FTIR-ATR, 1D and 2D NMR experiments, EIMS, and elemental analysis.

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