Results 121 to 130 of about 17,233 (279)

Ampliação e aplicação do método semi-empírico topológico (IET) em modelos QSRR/QSPR/QSAR para compostos alifáticos halogenados e cicloalcanos [PDF]

, 2008
Tese (doutorado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas. Programa de Pós-Graduação em Química.Este estudo foi desenvolvido para avaliar a capacidade de prognóstico do índice semi-empírico topológico (IET) em ...
Arruda, Anna Celia
core  

Low‐Temperature in Situ Upgrading of Ultra‐Deep Heavy Oil Using Ni–Ce/MOF–OTf Superacid Catalysts to Enhance Energy Utilization and Sustainability

EcoEnergy, EarlyView.
A triflate‐functionalized Ni–Ce/MOF–OTf superacid enables low‐temperature (∼140°C) in situ upgrading of ultra‐deep heavy oil. It reduces viscosity by 92.11% in 12 h, maintains activity over cycles, and delivers 90.25% recovery with a lower carbon footprint by selective bond cleavage. ABSTRACT Ultra‐deep heavy oil is an important unconventional resource,
Li Wang, Ji‐Xiang Guo, Qiming Huang, Kunpeng Li, Chi Li, Yajie Wu   +5 more
wiley   +1 more source

Effect of Polygonatum sibiricum on the Volatile Flavor Compounds of Wheat Qu and Its Brewed Huangjiu

Shipin gongye ke-ji
To investigate the effect of Polygonatum sibiricum on the volatile flavor compounds of wheat Qu and its brewed Huangjiu, the traditional wheat Qu (PTMQ) and its brewed Huangjiu (PTMQ-W) were used as controls, gas chromatography ion mobility spectroscopy (
Jianwei DONG, Guotai ZHANG, Huiying LIAO, Honglei TIAN, Jingzhang GENG, Xinpeng ZHU, Zaixiang LOU   +6 more
doaj   +1 more source

A High‐Performance Oxidized Graphene for Dendrite‐Free Anodes and Kinetically Enhanced Cathodes of Aqueous Zn‐Ion Batteries

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
Oxidized graphene rich in carboxylic acid groups obtained via a simple electrochemical exfoliation route is shown to tackle the main challenges of aqueous Zn‐ion batteries (AZIBs), specifically short Zn anode cycle life and sluggish cathode reaction kinetics.
Enrique Álvarez‐Rubiera, José M. Munuera, Julen Beitia, Cian Gabbett, Alba Suárez‐Fernández, Eider Goikolea, Jonathan N. Coleman, Idoia Ruiz de Larramendi, Silvia Villar‐Rodil, Juan I. Paredes   +9 more
wiley   +1 more source

GC-IMS-Based Volatile Characteristic Analysis of Hypsizygus marmoreus Dried by Different Methods

Foods
Gas chromatography–ion mobility spectroscopy (GC-IMS) was used to analyze the volatile components in dried Hypsizygus marmoreus of different drying methods, including hot air drying (HAD), heat pump drying (HPD), heated freeze-drying (HFD), and unheated ...
Pufu Lai, Longxiang Li, Yingying Wei, Junzheng Sun, Baosha Tang, Yanrong Yang, Junchen Chen, Li Wu   +7 more
doaj   +1 more source

Catalytic Formation of Ketones from Unactivated Esters through Rhodium Chelation-Assisted C–O Bond Activation

, 2016
A new method for building aryl aryl ketones containing heterocyclic rings through chelation-assisted C–O bond activation catalyzed by a rhodium complex has been developed. In this reaction, methyl quinoline-8-carboxylate, methyl quinoxaline-5-carboxylate,
Kaixin Tan (1915642), Yun Tian (411157), Jingjing Wang (140791), Xinrui Zhang (1915648), Sujing Zuo (1915645), Jianhui Wang (617970), Weiqiang Chen (164339)   +6 more
core   +1 more source

Dilithium Enediamide Derived From a 1,4‐Diaza‐1,3‐diene: Reactivity of a Strongly N‐Basic, Highly C‐Nucleophilic Compound Toward C–H Acids

European Journal of Inorganic Chemistry, EarlyView.
The lithium enediamide complex 2 with intrinsically inverted C–N bond polarity combines strong basicity with unusual reactivity: deprotonation of malonates enables C–C bond formation without electron transfer. Depending on malonate substitution, electrophilic substitution or addition occurs at the enediamide CC bond.
Muhan Liang, Michael Kunze, Helmar Görls, Joachim Scholz   +3 more
wiley   +1 more source

Microbiome Flora and Metabolomics Analysis of Mung Bean Sour Liquid in Luoyang, China

Foods
In order to reveal the fermentation microflora and fermentation metabolites of traditional mung bean sour liquid (MBSL) in Luoyang area, China, this experiment was sampled from four administrative districts of Luoyang, and volatile metabolites and non ...
Xinyi Zhang, Shengjuan Zhao, Jiangfeng Yuan, Lixing Feng   +3 more
doaj   +1 more source

The Methyl Group as a Source of Structural Diversity in Heterocyclic Chemistry:  Side Chain Functionalization of Picolines and Related Heterocycles

, 2016
The reaction of 2-picoline at the methyl group with NDA and KDA followed by dimethyldisulfide trapping furnished, respectively, dithioacetals and trithioortho esters with high selectivity.
Yves Fort (1404295), Emmanuel Aubert (1576186), Victor Mamane (1930381)   +2 more
core   +1 more source

Dilithium Enediamide Derived From 1,4‐Diaza‐1,3‐Diene: An Electron Reservoir Enabling Variable Reactivity Toward Carbonyl Compounds

European Journal of Inorganic Chemistry, EarlyView.
Upon reduction of 1,4‐diaza‐1,3‐diene 1 to the dilithium enediamide 2, the polarity of the C = N bonds is reversed ‐ a classic case of umpolung. This behavior is particularly evident in reactions of the dianion 2 with carbonyl compounds and also explains why 1,4‐diaza‐1,3‐diene ligands do not always act merely as spectator ligands. 1,4‐Diaza‐1,3‐dienes
Muhan Liang, Michael Kunze, Helmar Görls, Joachim Scholz   +3 more
wiley   +1 more source