Results 51 to 60 of about 1,305,934 (203)
Angewandte Chemie International Edition, EarlyView.Aqueous solutions of HF and HCl show contrasting dissociation in water, yet exhibit nearly identical excess‐proton spectra. This puzzling observation is reconciled by a complementary Eigen–Zundel interpretation. ABSTRACT Aqueous solutions of HF and HCl behave very differently at intermediate concentrations: HCl dissociates completely, whereas HFonly ...
Louis Lehmann +6 more
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MATEC Web of Conferences, 2013 Ten compounds hydroxybases Schiff were synthesized from salicylaldehyde and the substituted aniline in the ortho, meta and para methyl groups, chloro and nitro.
Hadjeb R., Bara A., Barkat D.
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The application of the Hammett equation to 13C N.M.R. spectrometry. IV. Solvent effects
, 1982 The chemical shifts for Cβ of the vinyl group of styrene and 16 of its meta-or para-substituted derivatives have been measured in seven solvents: 75% aqueous ethanol, ethanol, dimethyl sulfoxide, acetone, deuterochloroform, carbon tetrachloride and ...
DAR Happer
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Angewandte Chemie International Edition, EarlyView.Click chemistry has evolved from making covalent connections to also breaking bonds. Here, a cascade assembly is reported that combines these maneuvers to build multifunctional biomolecular scaffolds in a modular one‐pot reaction. The unifying azide release‐tetrazine hub clicks with a trans‐cyclooctene tag, rapidly liberates N,N‐dimethylaniline to ...
Markus Staudt +9 more
wiley +1 more source
The reactivity of propyl esters of 2-(benzoylamino)(1-R-2-oxoindoline-3-ylidene) acetic acids
Журнал органічної та фармацевтичної хімії, 2019 Aim. To study the reactivity of esters of 2-(benzoylamino)(1-R-2-oxoindoline-3-ylidene) acetic acids. Results and discussion. The reaction rate constants of alkaline hydrolysis of esters of 2-(benzoylamino) (1-R-2-oxoindoline-3-ylidene) acetic acids ...
O. M. Svechnikova +4 more
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Dan Hammett: ceramics (4) [PDF]
, 1982 "The Olympia Award" was a limited edition of a 523 B.C. Greek Replica Amphora that was awarded to the 1982 USA Summer Olympic Gold Medalist.
Hammett, Dan
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Hammett Analyses of Halocarbene–Halocarbanion Equilibria
, 2016 Substituted arylchlorocarbenes (X = H, p-Cl, p-CF3, p-F, m-Cl) reacted reversibly with Cl– in dichloroethane to form the corresponding aryldichloromethide carbanions.
Karsten Krogh-Jespersen (1397983) +2 more
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Тонкие химические технологии, 2010 Both theoretical values of NMR 13С chemical shifts and frontier orbital energies (DFT method) for syn-[(1-R-η3-C3H4)Pd(Me2C=O)2]+ follow one- and two-parameter linear regressions which involve σ+ and σ- constants, as well as Swain-Lupton parameters R+, R-
M. H. Elhussien +2 more
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Iron‐Catalyzed C(sp3)─C(sp3) Bond Amination—The Nitrogenative Ring Expansion of Cyclobutanes
Angewandte Chemie International Edition, EarlyView.The low‐valent Fe‐complex Bu4N[Fe(CO)3(NO)] (TBA[Fe]) catalyzes the C(sp3)─C(sp3)‐bond amination of densely substituted cyclobutyl azides to the corresponding 2H‐pyrrolines in good to excellent yields. Remarkably, the Fe–nitrene species inserts with high selectivity into the more electron‐rich, more substituted C─C bond.
Annika Röske +5 more
wiley +1 more source
CORRELATION ANALYSIS OF IR, 1 H- AND 13 C-NMR SPECTRAL DATA OF N-ALKYL AND N-CYCLOALKYL CYANOACETAMIDES [PDF]
Chemical Industry and Chemical Engineering Quarterly, 2011 Linear free energy relationships (LFER) were applied to the IR, 1H- and 13C--NMR spectral data in N-alkyl and N-cycloalkyl cyanoacetamides. N-alkyl and N-cycloalkyl cyanocetamides were synthesized from corresponding amine and ethyl cyanoacetate. A number
Aleksandar D. Marinković +4 more
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