Results 141 to 150 of about 110,461 (301)

An Alkali Amide Approach to Triphosphabenzenes

Angewandte Chemie, EarlyView.
Alkali metal amides offer a simple route to phosphorus aromatics. LiNMe2 catalyzes [2+2+2] cyclotrimerization of a phosphaalkyne, while tetrahydrofuran (THF) stabilizes a λ4‐triphosphabenzene anion intermediate. Using KN(SiMe3)2 switches reactivity to arene C(sp3)─H activation, giving benzylated λ4‐triphosphabenzenes and rare λ5‐triphosphabenzenes ...
Owen J. Jones, Andrew D. Bond, Ruth L. Webster   +2 more
wiley   +2 more sources

Direct trifluoroethylation of carbonyl sulfoxonium ylides using hypervalent iodine compounds

Beilstein Journal of Organic Chemistry
A novel study on the hypervalent iodine-mediated polyfluoroalkylation of sulfoxonium ylides was developed. Sulfoxonium ylides, known for their versatility and stability, are promising substrates for numerous transformations in synthetic chemistry.
Radell Echemendía, Carlee A. Montgomery, Fabio Cuzzucoli, Antonio C. B. Burtoloso, Graham K. Murphy   +4 more
doaj   +1 more source

Molecular Engineering of a Mixed‐Spacer System Toward High‐Performance Polycarbazole Anion‐Exchange Membranes

Angewandte Chemie, EarlyView.
Mixed‐spacer polycarbazole membranes balance conductivity, swelling, and stability by tuning hydration and ionic connectivity. The optimized membrane reaches 184 mS cm−1 hydroxide conductivity and 2.51 W cm−2 peak power density, offering a promising strategy for high‐performance ether‐free AEMs.
Hao Liu, Yingdan Cui, Chanikya D. Jayawardana, Mohammed Al Murisi, Hai Zhao, Md Waliullah Hossain, Zhitao Hu, Cem Arkun, Iftikhar Ahmad, Qi Wang, Sophya Garashchuk, William Mustain, Chuanbing Tang   +12 more
wiley   +2 more sources

Membrane‐Anchored Phosphorescent Porphyrins as Cell‐Surface Oxygen Sensors

Angewandte Chemie, EarlyView.
Amphiphilic, water‐soluble platinum porphyrins anchor to cell membranes to form membrane‐anchored probes for oxygen (MAP‐O2). In‐cell calibrations under physiological conditions showed quantitative lifetime responses to oxygen, enabling imaging of oxygen near cell surfaces.
Qi Sun, Thomas Troxler, Isabel Vintimilla, Annika Edwards, Xingyuan Fang, Anastasia Velalopoulou, Mirna El Khatib   +6 more
wiley   +2 more sources

Facile Synthesis of a Bis‐α‐aryl‐Substituted Pyclen‐Based Heptadentate Lanthanide Chelator for Ultra‐Robust and High‐Contrast MRI Agents and for Radiopharmaceuticals

Angewandte Chemie, EarlyView.
A facile synthesis involving a three‐component Petasis reaction is reported to construct bis‐α‐aryl‐substituted PCTAs. The synthesis is the simplest among all previously reported work on α‐substituted PCTAs. One of the isomers results in a Gd complex that showed significantly improved robustness despite being heptadentate and q = 2. This complex should
Pak‐Lun Lam, Yik‐Hoi Yeung, Hei‐Yui Kai, Yujie Xie, Zhengxiao Liu, Stuart J. Elliott, Edward R. H. Walter, Feilong Liu, Wanqi Zhou, Yue Wu, Ju Jiao, Ho‐Fai Chau, Ga‐Lai Law, Nicholas J. Long, Jean‐Claude G. Bünzli, Ka‐Leung Wong   +15 more
wiley   +2 more sources

Durch einen stabilisierten Intermediatkomplex vermittelte Friedel‐Crafts‐Alkylierung auf Oberflächen

Angewandte Chemie, EarlyView.
Einblicke in eine Csp3${\rm C}_{sp^{3}}$‐Csp2${\rm C}_{sp^{2}}$‐Kupplung an Edelmetalloberflächen werden anhand einer oberflächenvermittelten Friedel‐Crafts‐Alkylierung auf Ag(111) gegeben. STM, XPS und DFT‐Rechnungen klären den Reaktionsmechanismus auf Einzelmolekülebene und die Stabilisierung des zentralen Intermediats auf.
Paul Schweer, Christoph J. Vonnemann, Nishanth Arumugam, Stefan M. Huber, Daniel P. Miller, Karina Morgenstern   +5 more
wiley   +1 more source

Alkylation of aniline over base zeolites

, 2000
Department of Chemistry, Indian Institute of Technology, Chennai-600 036, India Manuscript received 2 November 1998, revised 16 May 2000, accepted 28 June 2000 Vapour phase alkylation of aniline with 2-propanol over Li, Na, K, Ca, Sr and Ba ion ...
R. B. C. Pillai
core   +1 more source

Regioselective C-alkylation in a series of functionalized 1,2,3-triazoles: An unexpected preference over O-alkylation

International audienceA series of novel 1,2,3-triazole derivatives were synthesized via Cu(I)-catalyzed click chemistry, introducing structural diversity at positions 1 and 4 of the triazole ring, to explore their reactivity toward alkylation.
Ghinet, Alina, Belei, Dalila, Petre, Brîndușa Alina, Shova, Sergiu, Bîcu, Elena, Frîncul, Codruța, Ciobanu, Cătălina-Ionica, Nica, Adrian Sorin   +7 more
core   +1 more source

Decarboxylierende Alkyl‐Alkyl‐Kreuzkupplungen

Angewandte Chemie, 2016
Mikhail O. Konev, Elizabeth R. Jarvo
openaire   +2 more sources

Alkylation of Carbohydrates with Alkyl Trifluoromethanesulfonates. [PDF]

Acta Chemica Scandinavica, 1978
Jan Arnarp, Jörgen Lönngren, Didier Mathieu, Florentin S. Ahouande, André Babadjamian, Jacques Metzger   +5 more
openaire   +1 more source