Results 31 to 40 of about 11,475 (180)

Cloisite 15Aº nanoclay as an effective PTC for the epoxidation of hydroxyl terminated polybutadiene (HTPB)

Polímeros, 2014
A simple method is reported for the epoxidation of hydroxyl-terminated polybutadiene (HTPB) by using in-situ generated dimethyl dioxirane (DMD) as an oxidant and Cloisite 15Aº nanoclay as a phase-transfer catalyst (PTC).
Mir Mohammad Alavi Nikje, Maryam Gholi Nataj   +1 more
doaj   +1 more source

Asymmetric Epoxidation of Olefins with Sodium Percarbonate Catalyzed by Bis-amino-bis-pyridine Manganese Complexes

Molecules, 2022
Asymmetric epoxidation of a series of olefinic substrates with sodium percarbonate oxidant in the presence of homogeneous catalysts based on Mn complexes with bis-amino-bis-pyridine ligands is reported.
Varvara A. Drozd, Roman V. Ottenbacher, Konstantin P. Bryliakov   +2 more
doaj   +1 more source

Selective epoxidation of soybean oil with performic acid catalyzed by acidic ionic exchange resins

Green Processing and Synthesis, 2013
This work studied the epoxidation of soybean oil with aqueous hydrogen peroxide and formic acid, in the presence of acidic ionic exchange resins as catalysts.
Turco Rosa, Vitiello Rosa, Russo Vincenzo, Tesser Riccardo, Santacesaria Elio, Di Serio Martino   +5 more
doaj   +1 more source

Biosynthesis of sulfonated carbon catalyst from carbohydrate polymer derivatives for epoxidation of Croton macrostachyus seed oil

Carbohydrate Polymer Technologies and Applications, 2022
In the present study, biosynthesis of sulfonated carbon acid catalyst from brewery spent grain through carbonation process followed by sulphonation method used for production of epoxy oil from Croton macrostachyus seed oil in presence of acetic acid as ...
Tafere Aga Bullo, Yigezu Mekonnen Bayisa, Mohammed Seid Bultum   +2 more
doaj   +1 more source

Stabilization of Single Metal Atoms on Graphitic Carbon Nitride: Synthetic Strategies and Emerging Applications

Advanced Science, EarlyView.
This review highlights recent advancements in stabilizing single metal atoms on graphitic carbon nitride emphasizing innovative synthesis strategies and emerging applications in electrocatalysis, photocatalysis and organic transformations, along with key challenges and future perspective. Abstract Emerging as a new frontier in catalysis science, single‐
Wenyao Zhang, Junjie Cui, Zhenjie Yao, Boyuan Zhu, Nithinraj Panangattu Dharmarajan, Ajayan Vinu, Junwu Zhu   +6 more
wiley   +1 more source

Review and perspectives on TS-1 catalyzed propylene epoxidation

iScience
Summary: Titanium silicate zeolite (TS-1) is widely used in the research on selective oxidations of organic substrates by H2O2. Compared with the chlorohydrin process and the hydroperoxidation process, the TS-1 catalyzed hydroperoxide epoxidation of ...
Jimei Yang, Shuling Liu, Yanyan Liu, Limin Zhou, Hao Wen, Huijuan Wei, Ruofan Shen, Xianli Wu, Jianchun Jiang, Baojun Li   +9 more
doaj   +1 more source

Spatial Control Over Tether‐Tunable Coordination on Palladium for Divergent Synthesis of Bicyclo[n.1.0]alkanes via Oxidative Cyclopropanation of Enynes

Advanced Science, EarlyView.
We have developed a Pd‐catalyzed oxidative cyclopropanation of 1,n‐enynes employing cyclic diacyl peroxides as bifunctional reagents that serve as both tether‐tunable oxidants and spatially controlled dicarboxylate anions. ABSTRACT Bicyclo[n.1.0]alkanes are highly valuable scaffolds in drug discovery and synthetic chemistry.
Ting Yuan, Lei Shi
wiley   +1 more source

Epoxidação do óleo de mamona e derivados empregando o sistema catalítico VO(acac)2/TBHP Epoxidation of castor oil and its derivatives using VO(acac)2/TBHP as the catalytic system

Química Nova, 2008
The alternative system VO(acac)2/TBHP was investigated for the epoxidation reaction of castor oil and its derivatives. Results of 88% of conversion, 73% of epoxidation and 82% of selectivity were obtained for the system containing 20% excess of TBHP and ...
Marta Regina dos Santos Nunes, Marcia Martinelli, Marcelo Monteiro Pedroso   +2 more
doaj   +1 more source

Iminologous Epoxide Ring-Closure

Chemical Science, 2022
Herein, we apply the principle of iminology to the well-established epoxide ring-closure reaction. The synthesis of tetrasubstituted, nitrile-tethered epoxides can be achieved via activation of iminologous diols followed by fragmentation. Mechanistic study reveals the transformation to be stereoretentive, which is consistent with the concerted nature ...
Chieh-Hung Tien, Alan J. Lough, Andrei K. Yudin   +2 more
openaire   +2 more sources

Attempted Synthesis of Vinca Alkaloids Condensed with Three-Membered Rings

Molecules, 2018
Our successful work for the synthesis of cyclopropanated vinblastine and its derivatives by the Simmons–Smith reaction was followed to build up further three-membered rings into the 14,15-position of the vindoline part of the dimer alkaloid ...
András Keglevich, Szabolcs Mayer, Réka Pápai, Áron Szigetvári, Zsuzsanna Sánta, Miklós Dékány, Csaba Szántay, Péter Keglevich, László Hazai   +8 more
doaj   +1 more source