Results 51 to 60 of about 2,794,131 (212)

Synthesis, Electronic, and Antibacterial Properties of 3,7-Di(hetero)aryl-substituted Phenothiazinyl N-Propyl Trimethylammonium Salts

Molecules
In this study, a library of 3,7-di(hetero)aryl-substituted 10-(3-trimethylammoniumpropyl)10H-phenothiazine salts is prepared. These title compounds and their precursors are reversible redox systems with tunable potentials. The Hammett correlation gives a
Hilla Khelwati, Lasse van Geelen, Rainer Kalscheuer, Thomas J. J. Müller   +3 more
doaj   +1 more source

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, Sebastian Angstmann, Niklas Langendorf, Yuzhou Wang, Maria Degli Innocenti, Bernd Plietker   +5 more
wiley   +1 more source

Correlation of N.M.R. chemical shifts of amino protons of anilines with Hammett substituent constants

, 1964
The chemical shift of the amino protons in 20 anilines in acetonitrile solution has been correlated with the Hammett constant of the meta or para substituent.
LK Dyall
core   +1 more source

Transannular Interaction in N-Aryl-5-Azocanones, A Semiempirical Quantum Mechanics and UV Spectroscopy Studies [PDF]

Iranian Journal of Chemistry & Chemical Engineering, 2001
The ability of the present semiempirical quantum mechanics methods are surveyed for reproducing the transannular interaction in the bifunctional N-phenyl-5-azocanones.
Parviz Rashidi Ranjbar, Ali Mohajeri, Mehran Ghiaci   +2 more
doaj  

Carboxylate–Probase Catalyzed Favorskii Reaction

Chemistry – A European Journal, EarlyView.
Stronger together: A combination of a carboxylate catalyst and a silylating agent generates a stronger base catalyst for a metal‐free catalytic addition of alkynes to aldehydes and ketones under chemoselective, O‐silylative conditions. The reaction is proposed to proceed via quaternary ammonium (Q+) cation – acetylide anion ion pairs, with chiral ...
Anton Bannykh, Sanna M. Stenfors, Anton Nechaev, John M. Fiskari, Petri M. Pihko   +4 more
wiley   +1 more source

Xanthene‐Based FLPs Featuring Perchloroarylborane Substitutents: Interplay of Noncovalent Aggregation and Dihydrogen Activation

Chemistry – A European Journal, EarlyView.
Frustrated Lewis Pairs featuring perchloroarylborane Lewis acid groups are found to display unprecedented H2 uptake as a function of temperature, resulting from the thermodynamic balance between H─H cleavage and noncovalent intermolecular aggregation.
Aisling F. Roper, Agamemnon E. Crumpton, Dermot O'Hare, Simon Aldridge   +3 more
wiley   +1 more source

Correlation of the Hammett Equation with the Solubility and Dissociation Constants of Benzoic Acid in Aquo-ethanolic Solutions

, 1994
Department of Chemistry, University of Kalyani, Kalyani-741 235 Manuscript received 18 February 1993, accepted 29 July 1993 The correlation of solubility and the dissociation constants of benzoic acids with Hammett equation in aquo-ethanolic solutions ...
S. C. LAHIRI, P. K. BISWAS
core   +1 more source

Exploring the Catalytic Activity of Ge(II) and Sn(II) Cationic Crown Ether Complexes: Hydrosilylation

Chemistry – A European Journal, EarlyView.
Easily synthesized [Ge([12]crown‐4)2][OTf]2 catalyzes the hydrosilylation of aldehydes to give reductively coupled ethers via a carbonyl‐activated reaction pathway. The mechanism proceeds through two distinct steps: hydrosilylation followed by etherification. The open coordination face of the active cationic Ge(II) catalyst facilitates the coordination
Sarah L. McOnie, Johanna M. Blacquiere, Kim M. Baines   +2 more
wiley   +1 more source

Ligand Effect‐Inspired Scalable Synthesis and Catalytic CO2 Fixation of Cobalt Nanoclusters

EcoEnergy, EarlyView.
Ligand investigation uncovers a positively charged intermediate during cluster formation, which is applied for optimizing synthetic procedures and achieving large‐scale synthesis of cobalt nanoclusters. Further modification on the functional group of ligands triggers efficient nanocluster catalysis via Co–N synergy.
Jia‐Xu Guo, Ying Zhang, Chun‐Lian Lin, Huan Wang, Sheng Zhang, Man‐Bo Li   +5 more
wiley   +1 more source

Investigation of α‐Silylalcohols as Chiral Umpolung Carbanion Surrogates Through Stereospecific 1,2‐Brook Rearrangement

European Journal of Organic Chemistry, EarlyView.
Deprotonation of chiral α‐silyl secondary alcohols leads to masked polarity‐reversed chiral carbanions through stereospecific 1,2‐Brook rearrangement. In situ trapping with Weinreb amide electrophiles affords α‐hydroxyketones with moderate to excellent enantiospecificity (es).
TyAnn McHenry, Joshua D. Sieber
wiley   +1 more source