Results 41 to 50 of about 4,902 (184)

External Organic Nitrogen Supply by Atmospheric Aerosols is Important Over the Northwest Pacific Ocean

Geophysical Research Letters, Volume 53, Issue 11, 16 June 2026.
Abstract Aerosol organic nitrogen (AON) is an important fraction of atmospheric N deposition over the open ocean. However, it is unclear how much of the AON is of external origin or internally recycled from the ocean. Here, we quantified AON over the Northwest Pacific Ocean using a newly developed Aerosol Nitrogen Analyzer and investigated its chemical
Yujue Wang, Yue Jiang, Xu Yu, Chao Yu, Hongyan Bao, Shubin Li, Yizhe Yi, Lin Zheng, Hong‐Hai Zhang, Chao Zhang, Xiaohong Yao, Huiwang Gao, Jian Zhen Yu, Min Hu   +13 more
wiley   +1 more source

Synthesis of fused cyclic chromene and alicyclic chromene derivatives from 2-amino-4-[4-(dimethylamino)phenyl]5-oxo-4H,5H-pyrano [3,2-c]chromene-3-carbonitrile

Al-Mustansiriyah Journal of Science, 2017
Derivatives of fused cyclic chromene and alicyclic chromene were synthesized starting from 2-amino-4-[4-(dimethylamino)phenyl]5-oxo-4H,5H-pyrano [3,2-c]chromene-3-carbonitrile. The structures of the synthesized compounds were elucidated by spectral data :
Hamid Hashim Mohammed
doaj   +1 more source

From Retigabine to Azetukalner: Reviving Voltage‐Gated Potassium Channels for Epilepsy Therapy

Archiv der Pharmazie, Volume 359, Issue 6, June 2026.
From the withdrawal of retigabine to the breakthrough of azetukalner, this review explores how rational redesign of KV7.2/3 potentiators overcame toxicity hurdles. We detail the synthesis, improved metabolic stability, and robust clinical outcomes in epilepsy, highlighting a new era of targeted potassium channel therapy. ABSTRACT Heterotetrameric KV7.2/
Pascal Rosendahl, Lukas Schulig, Andreas Link   +2 more
wiley   +1 more source

Microbially driven organic carbon cycling at the land−sea interface: Advances and an integrated study framework

mLife, Volume 5, Issue 3, Page 282-295, June 2026.
Abstract The land−sea interface is a vital component of global biogeochemical cycles, where microorganisms drive the cycling of carbon, nitrogen, and sulfur. This review synthesizes the research progress from representative land−sea interfaces to elucidate how the microbial community structure and metabolic function influence the mobilization ...
Quanrui Chen, Kai Tang, Zhili He, Meng Li, Jun Yang, Weidong Zhai, Qiang Zheng, Nianzhi Jiao   +7 more
wiley   +1 more source

Fast Method for Synthesis of Alkyl and Aryl-N-Methylnitrones

Molecules, 2011
A simple, fast, efficient and eco-friendly procedure was developed for the synthesis of alkyl and aryl-N-methylnitrones. The corresponding nitrones of aromatic aldehydes, aliphatic aldehydes and alicyclic carbonyl compounds were prepared from N ...
Yilmaz Yildirir, Naki Colak, Hamdi Ozkan, Serkan Yavuz   +3 more
doaj   +1 more source

Mechanistic Paths for the Gold(I)‐Catalyzed Heteroannulation of Salicylic Amides With Apolar Alkynes Explored With Density Functional Theory Calculations

European Journal of Organic Chemistry, Volume 29, Issue 18, 14 May 2026.
A manifold of catalytic reaction paths can operate in the Au(I)‐catalyzed heteroannulation of salicylic amides and alkynes. However, a subtle initial nucleophilic advantage of N versus O and a kinetic bottleneck at an advanced stage of the mechanistic machinery seems to suffice for the reaction to run on a single path and with exquisite selectivity. We
Ioannis Stylianakis, Evaggelia Vlachou, Carlos Silva López, Antonios Kolocouris   +3 more
wiley   +1 more source

Depolymerization and Reuse of Polycarbonates: Emerging Classes, Mechanisms and Challenges

Angewandte Chemie, Volume 138, Issue 19, 4 May 2026.
This review collects the latest developments in the area of chemical and catalytic polycarbonate recycling strategies and includes the controlled degradation of similar types of macromolecules. Apart from the main strategies for deconstruction, the key mechanistic features of these depolymerization processes are also discussed together with the ...
Davide Rigo, David H. Lamparelli, Antonio Buonerba, Carmine Capacchione, Arjan W. Kleij   +4 more
wiley   +1 more source

Criss-cross Cycloadditions on Ketazines Derived from Alicyclic Ketones

Molecules, 2006
The reactivity of alicyclic ketazines in criss-cross cycloadditions was investigated. They react with potassium cyanate and ammonium thiocyanate in the presence of acetic acid to form spirocyclic perhydro[1,2,4]triazolo[1,2-a][1,2,4]triazole-1,5-diones ...
Milan Potacek, Jiri Verner
doaj   +1 more source

Multicomponent polyimide films for enhanced energy storage

e-Polymers
Polymer dielectric films have extensive applications in power systems, pulse power systems, hybrid vehicles, and clean energy. However, with advancements in energy storage technology and increasingly demanding operating environments, particularly under ...
Hu Jinglong, Liu Minjiang, Xia Yuxin, Li Yan, Xu Xiaoyan   +4 more
doaj   +1 more source

(25R)-5a-Spirostane-3,12-dione

Acta Crystallographica Section E, 2009
The title compound, C27H40O4, was obtained from the oxidation of (25R)-3b-hydroxy-5a-spirostan-12-one (Hecogenin) by Jone's reagent. The molecule contains six alicyclic and heterocyclic rings, all trans-fused, among which four six-membered rings adopt ...
Ling-Li Zheng, Ming-Yong Yuan, Zhi-He Zang, Tie-Ying Zi   +3 more
doaj   +1 more source