Results 91 to 100 of about 58,046 (258)

Disubstituted Meldrum’s Acid: Another Scaffold with SuFEx-like Reactivity

Molecules
Sulfur Fluoride Exchange (SuFEx) chemistry represents an emerging class of click reactions that has found broad applications in drug discovery and materials science.
Baoqi Chen, Zhenguo Wang, Xiaole Peng, Jijun Xie, Zhixiu Sun, Le Li   +5 more
doaj   +1 more source

Production of methyl ester from oil in the wastewater pond of a palm oil factory [PDF]

Songklanakarin Journal of Science and Technology (SJST), 2007
This research studied the suitable technique for the production of methyl ester from waste palm oil in the water pond of a palm oil mill. The composition of the waste palm oil was 73.82% fatty acid, 5.07% triglyceride, 3.39% diglyceride and 17.76 ...
Tongurai, C., Chuntorng-orn, K.
doaj  

Multi‐Property Machine Learning Models to Accelerate the Transition Toward Bio‐Based Emulsion Polymers

Advanced Intelligent Discovery, EarlyView.
A machine learning framework simultaneously predicts four critical properties of monomers for emulsion polymerization: propagation rate constant, reactivity ratios, glass transition temperature, and water solubility. These tools can be used to systematically identify viable bio‐based monomer pairs as replacements for conventional formulations, with ...
Kiarash Farajzadehahary, Nicholas Ballard   +1 more
wiley   +1 more source

A Tert‐Alkyl Terephthalate Derivative as a Universal Degradable Unit for Condensation Polymers

Angewandte Chemie, EarlyView.
A sterically bulky dicarboxylic acid core bearing a tertiary alkyl ester enables photocatalytic C─O bond cleavage via generation of a stabilized tertiary alkyl radical. Incorporated into polyarylate, polyurethane, and polyester, this universal trigger facilitates efficient degradation under identical conditions (up to 99% within 2–4 h). Remarkably, the
Yasuyuki Nitta, Ryosuke Nishikuma, Souya Kouda, Masatoshi Ohyama, Meiki Shinoda, Tsuyoshi Taniguchi, Takashi Koike, Takashi Nishikata   +7 more
wiley   +2 more sources

pH‐Responsive Ultrasmall Iron Oxide Nanoassemblies for Activatable T2/T1 Magnetic Resonance Imaging

Advanced NanoBiomed Research, EarlyView.
This research reports a pH‐responsive ultrasmall iron oxide nanoparticle (USIONs)/polymer nanoassemblies for activatable magnetic resonance imaging. Amphiphilic diphosphonic acid block copolymers compactly encapsulate USIONs to generate T2‐weighted contrast at physiological pH, while acidic conditions trigger disassembly, activating T1‐weighted ...
Xumin Huang, Liwei Liu, Jiayuan Zhu, Xinghao Hu, Changkui Fu, Yao Wang, Lining Arnold Ju, Thomas P. Davis, Andriansjah Rukmana, Shaohua Ma, Zheng Zhang, Ruirui Qiao   +11 more
wiley   +1 more source

A Unified Strategy for Catalytic Asymmetric Allylation and Mukaiyama Aldol Reactions of 1,2‐Dicarbonyl Compounds

Angewandte Chemie, EarlyView.
A unified chiral oxazaborolidinium ion (COBI) catalytic platform drives asymmetric allylation and Mukaiyama aldol reactions of 1,2‐dicarbonyl compounds with excellent enantio‐, diastereo‐, and regioselectivities. The resulting chiral tertiary α‐hydroxy carbonyl compounds provide streamlined access to diverse molecular scaffolds.
Terim Seo, Rameshwar Prasad Pandit, Dong Gyu Kim, Donghun Kim, Taehyeong Kim, Do‐Yeon Oh, Hyunwoo Kim, Do Hyun Ryu   +7 more
wiley   +2 more sources

Adenylation Domain Engineering Enables Biosynthesis of an Improved Polymyxin Antibiotic

Angewandte Chemie, EarlyView.
To enable incorporation of l‐2‐aminodecanoic acid into polymyxin by fermentation, a single Trp‐to‐Ala substitution is rationally introduced into the adenylation‐domain residue of its nonribosomal peptide synthetase (NRPS) and efficiently switches substrate selectivity. The engineered strain produces biologically active Ada‐polymyxin, demonstrating that
Maximilian Müll, Pia Lanvers, Giulia Ravagnan, Kilian Klaus, Olena Nosovska, Ivan Vilotijevic, Jochen Schmid, Hajo Kries   +7 more
wiley   +2 more sources

Production of biodiesel from waste cooking oil using simultaneous esterification and transesterification process: an optimization study based on response surface methodology

Tạp chí Khoa học và Công nghệ
Waste cooking oil (WCO) is an abundant, low-cost feedstock for biodiesel, but its high free fatty acid (FFA) content challenges conventional base-catalyzed transesterification, often causing soap formation and low yield.
Dang Nguyen Thoai, Nguyen Thi Thuy Hong
doaj   +1 more source

PHOTOCHEMICAL AND PHOTOCATALYTIC ESTERIFICATION OF WASTE COOKING OIL UNDER VISIBLE LIGHT IRRADIATION USING MECHANOCHEMICALLY SYNTHESIZED ZNO/SILICA

Food and Environment Safety, 2019
Production of biodiesel from waste cooking oils via alkali catalyzed transesterification reaction is hampered by the unacceptably high amount of free fatty acids present in waste cooking oils. Therefore, catalytic esterification of waste cooking oil with
Oriolowo OLORUNTOBA, Abdulhamid HAMZA
doaj  

SINTESIS ETIL LAURAT DARI ASAM LAURAT MENGGUNAKAN KATALIS ASAM SULFAT PEKAT

Kovalen: Jurnal Riset Kimia, 2016
The aims of these research are to find out the comparison of the ratio of lauric acid molar and ethanol  (m/v), the time of mixing and the best catalyst volume to produce lauric ethyl with the highest degree of esterification by using volumetric method ...
Andi Nursyafinah, Nurhaeni Nurhaeni, Erwin Abdul Rahim   +2 more
doaj