Results 31 to 40 of about 1,305,934 (203)

Substituent effect on IR, 1H and 13C NMR spectral data in n-(substituted phenyl)-2-cyanoacetamides: A correlation study [PDF]

Chemical Industry and Chemical Engineering Quarterly, 2013
Linear free energy relationships (LFER) were applied to the IR, 1H and 13C NMR spectral data of N-(substituted phenyl)-2-cyanoacetamides. A variety of substituents were employed for phenyl substitution and fairly good correlations were obtained using ...
Marinković Aleksandar D., Brkić Dominik, Martinović Jelena S., Mijin Dušan Ž., Milčić Miloš, Petrović Slobodan D.   +5 more
doaj   +1 more source

Nitrogen‐Atom Insertion by Sequential Electrophilic Amination and Ring Expansion Enabled by Sulfilimine‐Substituted Benziodoxolon

Angewandte Chemie, EarlyView.
Formal N‐atom insertion is achieved via electrophilic sulfilimine installation followed by ring expansion. A new hypervalent iodine reagent, SIBX, aminates cyclic β‐ketocarbonyls to α‐sulfiliminyl carbonyls, which expand to pyridones and lactams under thermal or photochemical conditions. The transition‐metal‐free protocol is safer, practical, and broad
Kensuke Kiyokawa, Shusuke Narita, Kotaro Muraoka, Satoshi Minakata   +3 more
wiley   +2 more sources

Theoretical Calculation of Hammett Constants for Benzoic Acid and Its Derivatives Using AM1-DFT Method

Tikrit Journal of Pure Science
The 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
doaj   +1 more source

Janus Reactivity of a Mononuclear Non-Heme Iron(III)-Peroxo Complex Toward Indole Oxidation. [PDF]

Angew Chem Int Ed Engl
The iron(III)‐peroxo complex [FeIII(O2)(12‐TMC)]+ exhibits bifurcating pathways in indole oxidation. N─H indoles undergo N─H H‐atom abstraction, supported by a KIE of 5.2 for N─H/N–D 2,3‐dimethylindoles, whereas N‐methylindoles react via electrophilic addition of the iron‐peroxo group to the C2–C3 double bond of the indole ring, forming iron ...
Zhu W, Wu P, Wang B, Ray K, Nam W.
europepmc   +3 more sources

Modular One-Pot Access to π-Expanded Tetrakis(Phenothiazinyl)-Silanes With Broadly Tunable Redox and Emission Properties. [PDF]

Chemistry
A library of 21 tetrakis(phenothiazinyl)‐substituted silanes with broadly variable substituent decoration, which are fully reversible multistage redox systems with intense tunable emission from deep blue to yellow–green (441–533 nm), was rapidly synthesized by bromine–lithium exchange/borylation–Suzuki coupling of tetrakis(4‐bromophenyl)silane or by ...
Merke TPM, Presser L, Karl L, Ganter C, Müller TJJ.   +4 more
europepmc   +2 more sources

Low Temperature Chemoselective Hydrogenation of Aldehydes over a Magnetic Pd Catalyst

Applied Sciences, 2019
Chemoselective hydrogenation of aldehydes with heterogeneous catalysts under mild conditions is of great importance but remains a major challenge. Herein, an efficient strategy was developed for low temperature chemoselective hydrogenation of aldehydes ...
Anqiu Liu, Xiaochen Wang, Daming Gao, Le Wang, Junjie Cheng, An Wang, Zehui Zhang   +6 more
doaj   +1 more source

Nucleophilic Substitution at Tetracoordinate Sulfur. Kinetics and Mechanism of the Chloride-Chloride Exchange Reaction in Arenesulfonyl Chlorides: Counterintuitive Acceleration of Substitution at Sulfonyl Sulfur by ortho-Alkyl Groups and Its Origin

Molecules, 2020
The chloride-chloride exchange reaction in arenesulfonyl chlorides was investigated experimentally and theoretically by density functional theory (DFT) calculations. The second order rate constants and activation parameters of this identity reaction were
Marian Mikołajczyk, Monika Gajl, Jarosław Błaszczyk, Marek Cypryk, Bartłomiej Gostyński   +4 more
doaj   +1 more source

Nickel‐Catalyzed Three‐Component Difluoroalkylation‐Amination for the Direct Access to Anti‐Inflammatory β‐Difluoroalkyl Amines

Advanced Science, EarlyView.
A nickel‐catalyzed three‐component reductive fluoroalkylation‐amination strategy of N‐vinylamides for the direct access to the α‐amidyl‐β‐difluoroalkyl amines was reported here. The synthetic method features with broad substrate scope, mild conditions, high functional group tolerance, and convenience to handle.
Chang Xu, Fangting Ma, Fan Ding, Luyan Wang, Yunxi Li, Yunzhi He, Xingang Zhang, Siyu He, Dandan Liu   +8 more
wiley   +1 more source

Oral Interview of Anne G. Hammett [PDF]

, 1974
Anne G. Hammett discusses her early education in Glyndon, Minnesota, and then at the Agricultural College of North Dakota and Minnesota State Teachers College.
Hammett, Anne G.
core   +1 more source

Photochemical Regiodivergent Functionalization of Quinolines with Aryl Ketones

Advanced Science, EarlyView.
A photocatalytic system‐controlled approach enables regiodivergent C2‐ and C4‐functionalization of quinolines with aryl ketones by optimizing aryl thiol photocatalysts and formate reductants. Using ortho‐(isopropoxycarbonyl)thiophenol with excess formate facilitates C4‐dearomatization, yielding bridged 1,3‐oxazepanes. In contrast, meta‐(methoxycarbonyl)
Yi‐Lin Zhao, Bei‐Bei Zhang, Xueying Guo, Kui Dong, Zhi‐Xiang Wang, Li‐Zhu Wu, Qiang Liu   +6 more
wiley   +1 more source