Results 21 to 30 of about 2,266 (161)
Basicity Characterization of Imidazolyl Ionic Liquids and Their Application for Biomass Dissolution
International Journal of Chemical Engineering, 2018 Alkalinity determination is of crucial significance for the applications of basic ionic liquids with imidazolyl. In this work, the ionization constant pKb value and acid function H- values of ionic liquids synthesized were calculated by pH method and UV ...
Chao Liu, Youming Li, Yi Hou
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Resonance Effect in Hammett Relationship. IV. Linear Free Energy Relationship based on the Normal Substituent Constants [PDF]
Bulletin of the Chemical Society of Japan, 1966 Abstract A set of normal substituent constants, σ0, was derived from the rates of alkaline hydrolysis of m- and p-substituted ethyl phenylacetates in 60% (v/v) aqeuous acetone at 25.0°C. The obtained values of σ0-constants were generally identical with Taft’s values within experimental uncertainty.
Yasuhide Yukawa +2 more
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Angewandte Chemie, EarlyView.Protic molecules containing strong O─H or N─H bonds typically resist hydrogen‐atom abstraction because of the high reactivity of the resulting heteroatom‐centered radicals. However, association of the protic molecules with redox‐active Lewis acids can provide powerful hydrogen‐atom donors or proton‐coupled‐electron‐transfer reagents.
Petra Vojáčková, Armido Studer
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Borylcyclopropanes: Synthetic Strategies and Applications
Angewandte Chemie, EarlyView.Borylcyclopropanes (cyclopropanes bearing a boron substituent) sit at the intersection of two privileged frameworks in synthesis. This review provides the first exhaustive survey of their chemistry, spanning metal–carbene, nucleophilic cyclization, radical, hydroboration, and C─H activation routes, and documenting applications in medicinal chemistry ...
Aiza A. Butt, Joseph M. Ready
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E-Journal of Chemistry, 2009 The kinetics of oxidation of benzaldehyde (BA) and para-substituted benzaldehydes by imidazolium dichromate (IDC) has been studied in aqueous acetic acid medium in the presence of perchloric acid.
S. Sheik Mansoor, S. Syed Shafi
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The Hammett Relationship in the Reduction of Aldehydes with 2-Propanol by Catalysis with Hydrous Zirconium Oxide [PDF]
Bulletin of the Chemical Society of Japan, 1988 Abstract A linear correlation of the Hammett relationship was obtained for a catalytic reduction of substituted benzaldehydes with 2-propanol with hydrous zirconium oxide. The reaction constant ρ was 1.35, indicating that the electronic effect on the reaction is larger than that on the standard one.
Makoto Shibagaki +3 more
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Angewandte Chemie, EarlyView.Enantioselective aminoarylation of ortho‐allyl anilines is achieved under mild conditions. Key to success is the electrostatically‐directed nature of the key aminopalladation step, achieved by using the sulfonated chiral ligand sSPhos on palladium. A detailed study of electronic trends allows tuning of the sulfonamide protecting group to enable good ...
Max Kadarauch +4 more
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Tikrit Journal of Pure ScienceThe Hammett equation constants were calculated theoretically by statistically correlating the practical Hammett equation constants for these compounds with several theoretically calculated structural properties.
Abdullah Ramadan Ali, Faiz M. Hamid
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Leveraging graph neural networks to predict Hammett’s constants for benzoic acid derivatives
Artificial Intelligence ChemistryThe Hammett constants, σm and σp, reflect the electron-withdrawing and electron-donating abilities of substituents on aromatic compounds, and have been successfully used in various structure-activity relationship studies.
Vaneet Saini, Ranjeet Kumar
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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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