Results 71 to 80 of about 59,417 (298)

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

Chemical looping epoxidation

Journal of Catalysis, 2018
Chemical looping epoxidation of ethylene was demonstrated, whereby the sole oxidant was a solid oxygen carrier, 15 wt% Ag supported on SrFeO3. Ethylene reacted with a bed of carrier particles, without any O2(g) in the feed, to produce ethylene oxide (EO) and CO2.
Chan, MSC, Marek, E, Scott, SA, Dennis, JS   +3 more
openaire   +2 more sources

Coordinative Ring‐Opening Polymerization of Limonene Carbamate towards Phosgene‐ and Isocyanate‐Free Polyurethane

Angewandte Chemie International Edition, Accepted Article.
This study presents a phosgene‐ and isocyanate‐free route for the synthesis of polyurethanes using (R)‐limonene as a bio‐based starting material. The synthesis of the cyclic limonene‐based carbamate monomer LU is achieved in high yields using dimethyl carbonate as a sustainable, less hazardous phosgene surrogate and is verified by NMR, SC‐XRD, ESI‐MS ...
Jonas Futter, Leon Ferdinand Richter, Stefanie Hörl, Bernhard Rieger, Moritz Kränzlein   +4 more
wiley   +1 more source

Lipase-mediated epoxidation of alkenes in supercritical carbon dioxide

Green Chemistry Letters and Reviews, 2018
In this work, supercritical carbon dioxide was used as reaction media in the lipase-mediated epoxidation of alkenes for the first time. Under the optimal conditions (alkene (1 mmol), novozym 435 (15 mg), H2O2 (50% aqueous solution, 1.4 mmol), n-caprylic ...
Jiaxin Zhang, Wenwei Qian, Chunyu Wang, Ziyi Cao, Shanshan Chen, Liu Zhang, Yang Zhang, Lei Wang   +7 more
doaj   +1 more source

Selective and metal-free epoxidation of terminal alkenes by heterogeneous polydioxirane in mild conditions [PDF]

Royal Society Open Science, 2018
Polydioxirane (PDOX) was prepared by the treatment of polysalicylaldehyde with Oxone and was found as a selective, highly efficient and heterogeneous reagent for epoxidation of alkenes which can be successfully isolated.
M. Kazemnejadi, A. Shakeri, M. Nikookar, R. Shademani, M. Mohammadi   +4 more
doaj   +1 more source

Carbohydrate-derived iminium salt organocatalysts for the asymmetric epoxidation of alkenes [PDF]

, 2014
A new family of carbohydrate-based dihydroisoquinolinium salts has been prepared and tested for potential as asymmetric catalysts for the epoxidation of unfunctionalized alkene substrates, providing up to 57% ee in the product ...
Adam, Adam, Adamo, Adamo, Aebischer, Aggarwal, Aggarwal, Armstrong, Armstrong, Armstrong, Armstrong, Armstrong, Armstrong, Armstrong, Bartlett, Bartlett, Berti, Bohé, Bohé, Bohé, Bombard, Boutureira, Boysen, Brandes, Brandes, Brodsky, Bulman Page, Bulman Page, Bulman Page, Bulman Page, Bulman Page, Bulman Page, Bulman Page, Bulman Page, Bulman Page, Bulman Page, Bulman Page, Bulman Page, Bulman Page, Bulman Page, Bulman Page, Bulman Page, Bulman Page, Bulman Page, Bulman Page, Bulman Page, Bulman Page, Bulman Page, Bulman Page, Burke, Campestrini, Cao, Catelani, Collman, Colman, Crich, Crosthwaite, Curci, Curci, Dalko, Davis, Davis, Davis, Davis, del Río, Dileep Kumar, Dolphin, Dorsey, Durantie, Durette, Forbes, Frohn, Gao, Gonçalves, Groves, Hanquet, Hanson, Ho, Irie, Jacobsen, John Liddle, Katsuki, Kim, Kochetkov, Koto, Käsbeck, Lee, Liu, López, Mansuy, Mark R.J. Elsegood, Matsuhashi, Matsuhashi, McGarrigle, Milliet, Milliet, Minakata, Nashed, Novikov, Novikov, Novikov, Novikov, Pacsu, Page, Philip C. Bulman Page, Qiu, RajanBabu, Rajanikanth, Ratcliffe, Rieche, Sharpless, Sheldrick, Sheldrick, Shi, Shu, Shu, Tian, Tian, Tsuda, Tu, Tu, Vachon, Vachon, Vargha, Vega-Pérez, Vega-Pérez, Vega-Pérez, Vic, Wang, Wang, Wang, Warren, Wong, Wong, Wu, Wu, Wu, Wu, Xia, Yang, Yang, Yang, Yang, Yang, Yohan Chan, Yong, Zhang, Zhang, Zhang, Zhu   +149 more
core   +1 more source

Surface Protected Organozirconium Catalyzes C–H Alumination of Saturated Hydrocarbons

Angewandte Chemie International Edition, Accepted Article.
Surface grafted organozirconium‐catalyzes C–H/Et–Al exchange reactions, involving saturated hydrocarbons and AlEt3, to afford organoaluminum compounds and ethane. The Zr(OtBu)3@SiO2‐Al2O3‐700 (1) catalyst contains monopodal ≡SiO–Zr(OtBu)3 and only a few residual silanols (<5%).
Aaron David Sadow, Sayak Banerjee, Jessica Rodriguez, Marco Mais, Frédéric A. Perras   +4 more
wiley   +1 more source

ROLE OF Mn(TPP)Cl IN THE EPOXIDATION WITH SINGLET OXYGEN [PDF]

Journal of Sciences, Islamic Republic of Iran, 2000
Mn(TPP)Cl catalyzes cooxidation of olefin in the singlet oxygenation of sulfid. Mn(TPP)Cl is able to transfer an oxygen atom from a peroxidic intermediate generated in singlet oxygenation of sulfide to a metal ion affording metal 0x0 species which is ...
doaj  

Chemical modification of Terminalia catappa L. kernel oil methyl ester using epoxidation-esterification approach, for application as bio-transformer fluid – Physicochemical characterization, kinetics and thermodynamics

Cleaner Chemical Engineering, 2022
Epoxidation-esterification of fatty acid methyl ester obtained from Terminalia catappa L. kernel oil (TCKO), its characterization, kinetics and thermodynamics were the main focus of this study.
Chinedu M. Agu, Kenechi Nwosu-Obieogu, Kingsley A. Ani, Albert C. Agulanna, Solomon O. Iwu-Ejike, Ozioma Onyinye Oguegbu, Matthew C. Menkiti   +6 more
doaj  

Formation of Tetrahydrofurano-, Aryltetralin, and Butyrolactone Norlignans through the Epoxidation of 9-Norlignans

Molecules, 2020
Epoxidation of the C=C double bond in unsaturated norlignans derived from hydroxymatairesinol was studied. The intermediate epoxides were formed in up to quantitative conversions and were readily further transformed into tetrahydrofuran, aryltetralin ...
Patrik A. Runeberg, Dominique Agustin, Patrik C. Eklund   +2 more
doaj   +1 more source