Results 111 to 120 of about 2,523 (263)

Aza‐Büchner–Curtius–Schlotterbeck Reaction Enables Selective Construction of Quaternary Carbon Centers

Angewandte Chemie International Edition, EarlyView.
We introduce the Aza‐Büchner–Curtius–Schlotterbeck (ABCS) reaction: A mild, catalyst‐free method for homologating aryl imines. Diverging from the traditional BCS mechanism, the diazo intermediate undergoes selective C─C insertion to form an all‐carbon quaternary center.
Simon O. Angerer, Vincent George, Aryaman Pattanik, Gaia Carpentiero, Tereza Morcinková, Julia Rehbein, Burkhard König   +6 more
wiley   +1 more source

Easy Access to Experimental Bond Dissociation Energies in Solution Using 2D‐IR Spectroscopy

Angewandte Chemie International Edition, EarlyView.
How strong is a chemical bond? The answer is hidden in the spacing of vibrational levels. This anharmonic fingerprint yields the energy needed to break an X─H bond from a single measurement, turning an ultrafast observable into a thermochemical quantity directly in the solvent of interest.
Joseph Kölbel, Laurent Sévery, Ricardo J. Fernández‐Terán   +2 more
wiley   +1 more source

Utilization of $^{13}$C NMR Carbon Shifts for the Attribution of Diastereomers in Methyl-Substituted Cyclohexanes

International audienceIn this report, we address the challenge of assigning diastereomers for methyl cyclohexanes, particularly those with quaternary centers, which remains nontrivial despite modern NMR techniques.
Cordier, Marie, Müller, Daniel S., Gellrich, Urs, Charki, Paul   +3 more
core   +1 more source

Seasonal Fluctuations of Plastochromanol‐8 and α‐Tocopherol Amounts in the Leaves of Cecropia Trees

Journal of the American Oil Chemists' Society, EarlyView.
ABSTRACT Plastochromanol‐8 (PC‐8) is a homologue of γ‐tocotrienol with a longer side chain (eight instead of three isoprene units) and therefore also a representative of the tocochromanol (vitamin E) group. PC‐8 has been determined in various plants and seeds, with Cecropia sp. leaves showing unusually high levels.
Rosalie Ormos, Jörg Rau, Walter Vetter
wiley   +1 more source

Mechanical Properties and Thermo‐Oxidative Aging of Hybrid EPDM Formulations With Bio‐Based Oils

Journal of Applied Polymer Science, EarlyView.
This study evaluates bio‐based oil as an eco‐friendly replacement for paraffinic oil in EPDM rubber. While pure bio‐oil matches conventional mechanical properties, specific blends (25% and 75%) improve tensile strength and stiffness. The 50% blend requires tempering to optimize its sulfur network and morphology, eventually yielding a 35% strength ...
D. Šimić, V. Spanheimer, L. Barbosa, U. Giese, D. Katrakova‐Krüger   +4 more
wiley   +1 more source

Zn/Al‐NO3 Layered Double Hydroxide as Alternative Activator for Nitrile Rubber Vulcanization: Effect of the Accelerator‐to‐Sulfur Ratio on Curing Kinetics and Network Properties

Journal of Applied Polymer Science, EarlyView.
Zn/Al‐NO3 layered double hydroxide offers a low‐zinc alternative for sulfur vulcanization of nitrile rubber, reducing nominal zinc loading by an estimated 71%. Its potential as a vulcanization activator depends on the curing system: conventional curing preserves tensile strength despite slower kinetics, whereas efficient curing maintains comparable ...
Lucas Castro Roza de Faria, Marcus Vinícius Alves Sampaio de Souza, Antonio Renato Bigansolli, Paulo Jansen de Oliveira, Fernanda Cristina Fernandes Braga, Marcelo Ferreira Leão de Oliveira, Carolina Guedes Fioravante Rezende, Marcia Gomes de Oliveira, Danieli Martins do Carmo   +8 more
wiley   +1 more source

Tailoring drug‐to‐lipid ratio in redox‐responsive lipid‐mimetic prodrug liposomes for superior cabazitaxel delivery and antitumor efficacy

BMEMat, EarlyView.
Redox‐responsive lipid‐mimetic prodrug liposomes with high drug‐to‐lipid ratios enhance cabazitaxel delivery, prolong circulation, and enable tumor‐selective drug release for superior antitumor efficacy and safety. Abstract Liposomes represent one of the most extensively investigated nanocarriers in drug delivery.
Shengyao Xu, Danping Wang, Si Zheng, Zhiyu Kuang, Ya Gao, Haiyu Zhao, Lurong Zhang, Jiayu Guo, Jingyi Zhang, Weiyao Li, Anhua Wang, Hongrui Lei, Zhonggui He, Ken‐ichiro Kamei, Jianzhao Niu, Lingyun Ma, Bingjun Sun   +16 more
wiley   +1 more source

A bioinspired catalytic nanoplatform for ferroptosis‐immunotherapy synergy in metastatic cancer

BMEMat, EarlyView.
The bioinspired nanoplatform MnMSN@MnP‐PEG co‐delivers manganese peroxidase and manganese ions to synergistically induce immunogenic ferroptosis and activate the cGAS‐STING pathway, eliciting potent antitumor immunity against primary and metastatic tumors.
Panpan Xue, Hai Cai, Ying Sun, Yaxin Ma, Siyuan Liu, Jinying Zhu, Yan Chen, Xuemei Zeng, Shuangqian Yan   +8 more
wiley   +1 more source

Electrostatic Effects on the Stability of 2,4,6-Trifluoromethylidenecyclohexanes, Cyclohexanones, and Cyclohexanethiones: Beyond Nonconventional Hydrogen Bonding. [PDF]

Chemphyschem
Freitas MP.
europepmc   +1 more source

Recent Advances in Ionizing Radiation as a Nonequilibrium Chemical Field for Catalysis

Carbon and Hydrogen, EarlyView.
Ionizing radiation acts as a nonequilibrium chemical field that generates reactive species and structural perturbations. These radiation‐induced effects bridge catalytic material construction, including metal loading, framework evolution, defect engineering, and carbon‐network reorganization, with selective transformations such as oxidation, reduction,
Junhua Kuang, Zhuo Liu, Jinlong Wan, Wenjie Duan, Li Peng, Liuxuan Cao, Jia Yu, Jian‐Feng Li, Shuliang Yang   +8 more
wiley   +1 more source