Results 151 to 160 of about 35,436 (307)

A Chiral Saddle‐Shaped Nanographene With Two Heptagon‐Embedded [4]Helicenes

Angewandte Chemie International Edition, EarlyView.
We present a novel synthetic strategy toward a chiral saddle‐shaped nanographene (cSNG) via a two‐step oxidation of a prochiral anthracene precursor. The Scholl‐type oxidation first yields a key intermediate with sp3‐defect heptagons, and subsequent oxidative dehydrogenation affords fully conjugated cSNG.
Felix Trautner, Boris Borrisov, Philipp Royla, Hongqing Zhao, Hartmut Komber, Li Wan, Evgenia Dmitrieva, Ji Ma, Jan J. Weigand, Qun Yang, Xinliang Feng, Wenhui Niu   +11 more
wiley   +1 more source

Synthesis of Functionalized Spiro-Heterocycles by Sequential Multicomponent Reaction/Metal Catalyzed Carbocylizations from Simple β-Ketoesters and Amides

, 2007
International audienceA new strategy from simple cyclic β-ketoesters or amides involving a selective three-component reaction and a ring closing metathesis or a palladium catalyzed carbocyclization in a sequential fashion to access spiro-heterocycles is ...
Habib-Zahmani, Hadjira, Rodriguez, Jean, Viala, Jacques   +2 more
core   +4 more sources

Asymmetric α‐Alkylation With Activated and Unactivated Electrophiles by a Highly Productive and Recyclable Lewis Acid/Imidazolium Catalyst

Angewandte Chemie International Edition, EarlyView.
An air‐stable, easily prepared, bifunctional Cu(II)/imidazolium complex enables highly enantioselective α‐alkylation of 1,3‐dicarbonyls with outstanding productivity (TON up to 1740). Highlights include broad electrophile scope spanning π‐activated and nonactivated reagents, stereo‐retentive allylation, simple catalyst synthesis, and efficient catalyst
Johanna Haußmann, Alexander Beck, Dominik Hornung, Michael Mistele, Alexander Allgaier, Wolfgang Frey, Joris van Slageren, Johannes Kästner, René Peters   +8 more
wiley   +1 more source

Synthesis, Molecular Docking Study, Anti-Oxidant and Cytotoxicity Evaluation of New Spiro Six Membered Ring Derivatives of 5-nitro isatin

Iraqi Journal of Pharmaceutical Sciences
Spiro-5-nitro isatino six memberd ring (quinazoline-4-one, thiazine-4-one and oxazine-4-one) respectively were produced by a cycloaddition of 5-nitro isatin Schiff bases [1–5] with anthranilic acid, o-mercapto benzoic acid and salicylic acid.
Hala Ayad Mohamed Rasheed, Suaad M. H. Al-Majidi   +1 more
doaj   +1 more source

Charge Transfer-oxy Radical Mechanism for Anti-cancer Agents [PDF]

, 1986
The proposal is advanced that anti-cancer drugs generally function by charge transfer resulting in formation of toxic oxy radicals which destroy the neoplasm.
Ames, James R., Cox, O., Elo, Hannu, Kovacic, Peter, Lumme, Paavo, Ryan, Michael D.   +5 more
core   +1 more source

Carbon/Silicon Heterojunction Solar Cells: Status and Perspectives

Carbon Energy, EarlyView.
This review examines carbon/silicon heterojunctions and highlights the advantages of carbon materials in terms of cost‐effectiveness, low‐temperature processing, and scalability. It adopts a comprehensive approach to bridge the gap between laboratory‐scale innovations and industrial‐scale applications, incorporating current state‐of‐the‐art findings ...
Randi Azmi, Adi Prasetio, Muhammad Iqbal Syauqi, Yanping Liu, Arsalan Razzaq, Nandang Mufti, Stefaan De Wolf   +6 more
wiley   +1 more source

Carbon Quantum Dots Meet Perovskite Solar Cells: A Review of Multifunctional Synergies

Carbon Energy, EarlyView.
This review highlights the multifunctional role of carbon dots in perovskite solar cells. Their applications as additives and interfacial modifiers are discussed in terms of crystallization control, defect passivation, energy‐level alignment, and environmental stability.
Yagmur Su Sayin, Matteo Bonomo, Nilgun Karatepe, Marta Feroci   +3 more
wiley   +1 more source

STUDIES ON SPIROHETEROCYCLES : SYNTHESIS OF NEW SPIRO 4- THIAZOLIDINONES AS POSSIBLE BIODYNAMICS [PDF]

Journal of Sciences, Islamic Republic of Iran, 1992
Spiro-4- thiazolidinones have been synthesized by the cyclocondensation of phthalazinyl hydrazones with cyclic ketones and substituted mercapto acetic acids. Compounds were screened for their antibacterial, antifungal and antihypertensive activity.
doaj  

Dry Vacuum Processing of Perovskite Films: Insights Into Growth and Precision Control Enabling Batch‐Stable High‐Efficiency Solar Cells

Carbon Energy, EarlyView.
This work establishes a standardized, additive‐free dry vacuum sublimation process for perovskite solar cells. By uncovering atomic‐scale growth mechanisms, we demonstrate that sequential deposition provides superior film quality compared to co‐deposition.
Jong Hun Yeo, Seung‐Woo Kim, Kyung Mun Yeom, Su Ji Moon, Hee Jeong Jeong, Jin‐Won Lee, Gill Sang Han, Dong Hoe Kim, Henk J. Bolink, Nam Joong Jeon, Beom‐Soo Kim   +10 more
wiley   +1 more source

2-Azidobenzaldehyde-Based [4+2] Annulation for the Synthesis of Quinoline Derivatives

Molecules
Quinoline is a privileged heterocyclic ring which can be found in many drug molecules and bioactive compounds. The development of synthetic methods for making quinoline derivatives continuously attracts the interest of organic and medicinal chemists ...
Xiaofeng Zhang, Miao Liu, Weiqi Qiu, Wei Zhang   +3 more
doaj   +1 more source