Results 71 to 80 of about 7,564 (224)

Iso‐Tellurazole N‐Oxides Assemble Adaptively Folded Macrocyclic Dodecamers

Chemistry – A European Journal, EarlyView.
Te…O Chalcogen bonding links twelve molecules into a ring that wraps itself around molecular guests. ABSTRACT Self‐assembled macrocyclic dodecamers were found in the crystals of new pseudo‐polymorphs of iso‐tellurazole N‐oxides. These structures are formed by molecules connected by NTe…O chalcogen bonds and are folded in a pattern that defines 89–153 ...
Jin Z. Wang, Phillip MacDougall, Mich W. Zeng, James F. Britten, Ignacio Vargas‐Baca   +4 more
wiley   +1 more source

Exploring the Boundaries of Aromaticity in Complex Structures and Excited States Through Computational Analysis

Chemistry – A European Journal, EarlyView.
Understanding aromaticity has evolved from benzene‐centric concepts to a broad multidimensional framework spanning organic, inorganic, and excited‐state systems. This review highlights ambiguities between magnetic, electronic, geometric, and energetic descriptors, emphasizing the need for unified, multi‐criteria approaches.
Sílvia Escayola, Miquel Solà, Albert Poater   +2 more
wiley   +1 more source

Foldamers With Two Distinct Helical Motifs Controlled by Solvent

Chemistry – A European Journal, EarlyView.
Alternating o‐phenylene and 2,3‐pyrazinylene oligomers were synthesized and their conformational behavior studied by NMR spectroscopy, x‐ray crystallography, and DFT calculations. They fold into well‐defined helices, but, remarkably, the folding motif depends on solvent: a compact helix in chloroform, but a much longer extended helix in acetone ...
Yinhui Liao, Vipul Batra, Govinda Prasad Devkota, Annabelle Ryu, Henry S. Oliver, David L. Tierney, C. Scott Hartley   +6 more
wiley   +1 more source

Nitrogen‐Site Isomerism Unlocks Exciton Dissociation in Vinylene‐Linked COF‐Based Photocatalysts

EcoEnergy, EarlyView.
Two regioisomeric vinylene‐linked covalent organic frameworks (COFs) constructed from diazine units with different nitrogen positions are developed for photocatalytic hydrogen evolution reaction (HER). Although structurally similar, the isomeric COFs exhibit distinct electron distribution and charge‐separation behaviors, leading to a more than twofold ...
Ming Wang, Zhongliang Wen, Chengbo Zhang, Wei Wang, Yaling Li, Xiaofang Su, Rached Ousji, Yanqiong Luo, Muhammad Imran Anwar, Rengui Li, Yanan Gao   +10 more
wiley   +1 more source

Selective N‐Functionalization of Pyrazoles

European Journal of Organic Chemistry, EarlyView.
This review traces the evolution of regioselective N‐functionalization strategies for pyrazoles, a key class of nitrogen heterocycles widely used in medicinal chemistry. Due to rapid tautomerism, N‐functionalization often lacks selectivity, leading to poor and unpredictable regioisomeric outcomes.
Lucas Popek, Matthias Schrader, Christopher J. Teskey   +2 more
wiley   +1 more source

Modular Synthesis of Di‐ and Triazadibenzoazulenes by a Cross‐Coupling/Cycloisomerization Strategy

European Journal of Organic Chemistry, EarlyView.
Two series of regioisomeric di‐ and triazadibenzoazulenes were prepared from dihalogenated imidazo[1,2‐a]pyridines and imidazo[1,2‐a]pyrazines. Imidazo[1,2‐a]pyridines and imidazo[1,2‐a]pyrazines are important nitrogen‐containing heterocycles with applications in medicinal and materials chemistry.
Karyna Kulyk, Artyom Petrosyan, Karsten Paul Lüdtke, Jonas Surkau, Martin Köckerling, Peter Ehlers, Peter Langer   +6 more
wiley   +1 more source

Biobased pyrazines

, 2022
Curiosity and sustainable development go hand in hand to help with the major problems of our time. This thesis shows how curiosity driven research can result in new insights. The thesis describes the development new building blocks from biomass, which have never been used in materials before, and their subsequent use in plastics.
openaire   +2 more sources

Spirobifluorene fusion in multiple resonance frameworks enables efficient pure‐red OLEDs with narrowband emission and suppressed efficiency roll‐off

FlexMat, EarlyView.
An orthogonal spirobifluorene‐fusion strategy is introduced for B/N/O‐alternated MR frameworks, enabling improved kRISC (5.46 × 103 s−1), high ΦPL (97%), and narrow‐band pure‐red emission. Vacuum‐evaporated OLEDs incorporating this emitter achieve an EQEmax >40% (FWHM = 36 nm) and exhibit exceptionally low efficiency roll‐off at high luminance ...
Yan‐Yun Jing, Han Wu, Xiaoling Xu, Sijie Xian, Jingsheng Miao, Xiaojun Yin, Chuluo Yang, Xiaosong Cao   +7 more
wiley   +1 more source

Pumpkin and chia seeds as functional foods and their application in different food products: A review

Food Biomacromolecules, EarlyView.
Abstract Functional foods have gained increasing attention for their capacity to promote health and reduce chronic‐disease risk beyond basic nutrition. Among plant‐based functional ingredients, pumpkin (Cucurbita spp.) and chia (Salvia hispanica L.) seeds are nutrient‐dense sources of proteins, unsaturated fatty acids, dietary fiber, tocopherols ...
Fatima Urooj, Fatima Javed, Abdul Mueez Ahmad, Laiba Younas, Sadia Ansar, Sumbal Raana, Muhammad Abdullah, Rimsha Amjad, Kashaf Basharat   +8 more
wiley   +1 more source

Volatile profiling from thermal decomposition of Amadori compounds in the alanine-glucose Maillard reaction: An DFT insight of 3-ethyl-2,5-dimethylpyrazine forming mechanism

Food Chemistry: X
The composition of volatile compounds generated by the thermal decomposition of Amadori rearrangement products (ARPs) in the Maillard reaction between glucose and alanine was investigated by using a combination of thermal desorption cryo-trapping system ...
Pengxun Gao, Shang Wang, Baomin Feng, Chunying Liu, Yi Wang, Shaohua Dou, Liang Dong   +6 more
doaj   +1 more source