Results 71 to 80 of about 319,868 (397)

Isothiourea‐Catalysed Acylative Kinetic and Dynamic Kinetic Resolution of Planar Chiral Paracyclophanols

Angewandte Chemie, EarlyView.
The highly selective acylative (dynamic) kinetic resolution of racemic paracyclophanols catalysed by a chiral isothiourea (5 mol%) is described (up to s = 50 at 49% conversion or up to 98:2 er and 96% yield in 30 examples). Rotational barriers were analysed for paracyclophanols and selected ester products.
Zhanyu Zhou, Kevin Kasten, Aidan P. McKay, David B. Cordes, Andrew D. Smith   +4 more
wiley   +2 more sources

Synthesis and Characterization of some New Mesoionic 1,3-Thiazolium-5-thiolates via Cyclodehydration and in situ 1,3-Dipolar Cycloaddition/Cycloreversion

Molecules, 2002
The title compounds were synthesized from C-aryl-N-methylglycines by Naroylation followed by a cyclodehydration to form the corresponding 1,3-oxazolium-5-olates.
Maria Joaquina Vieira, Aderson de Farias Dias, Alfredo Mayall Simas, Joseph Miller, Petrônio Filgueiras de Athayde Filho, Bruno Freitas Lira   +5 more
doaj   +1 more source

Efficient synthesis of piperazinyl amides of 18β-glycyrrhetinic acid

Beilstein Journal of Organic Chemistry, 2020
In the present study, a practical method to prepare piperazinyl amides of 18β-glycyrrhetinic acid was developed. Two main procedures for the construction of important intermediate 8 are discussed.
Dong Cai, ZhiHua Zhang, Yufan Meng, KaiLi Zhu, LiYi Chen, ChangXiang Yu, ChangWei Yu, ZiYi Fu, DianShen Yang, YiXia Gong   +9 more
doaj   +1 more source

Thermal and Tensile Mechanical Behavior of Acetic Anhydride Treated Silk Fibres

, 2014
Acylation of fibres can provide a route to have materials with better water proofing capability. In our present study, silk fibres were treated with various concentration (5, 10 and15 wt.%) of acetic anhydride aqueous solution and then thermal properties,
M. Haque, M. A. Zaman, M. M. Rahaman, Mofazzal Hossain, M. Maniruzzaman   +4 more
semanticscholar   +1 more source

Harnessing Synergistic Cooperation of Neighboring Active Motifs in Heterogeneous Catalysts for Enhanced Catalytic Performance

Advanced Materials, EarlyView.
This review examines the critical role of neighboring active motifs in heterogeneous catalysts, emphasizing how their synergistic cooperativity can be rationally designed to modulate catalytic properties. The discussion centers on the modulation of electronic and geometric structures, categorizing the catalytic systems into metal‐acid (Brønsted/Lewis ...
Peng Yuan, Ching Kit Tommy Wun, Tsz Woon Benedict Lo   +2 more
wiley   +1 more source

Backbone Protecting Groups for Enhanced Peptide and Protein Synthesis

Angewandte Chemie, EarlyView.
This review provides a comprehensive account of the use of backbone N‐protecting groups in peptide synthesis. It includes detailed synthetic methods relating to their introduction and removal and their application to “difficult” peptides and proteins of biological significance in both academic and industry contexts.
Samuel J. Paravizzini, Linda M. Haugaard‐Kedström, Craig A. Hutton, John A. Karas   +3 more
wiley   +2 more sources

4,5,6,7-Tetrachloro-2-(1H-imidazol-2-yl)isoindoline-1,3-dione

Molbank, 2012
4,5,6,7-Tetrachloro-2-(1H-imidazol-2-yl)isoindoline-1,3-dione was obtained by reaction of 2-aminoimidazole with 3,4,5,6-tetrachlorophthalic anhydride in refluxing acetic acid.
Conrad Kunick, Maximilian Wabnik, Renate Schnerre, Michael Haese, Bader Masri, Janine Joostberends, Jessica Friedrichs, Frederik Berndt, Sebastian Wölfel   +8 more
doaj   +1 more source

Facile and Efficient Acetylation of Primary Alcohols and Phenols with Acetic Anhydride Catalyzed by Dried Sodium Bicarbonate

, 2013
A variety of primary alcohols and phenols were reacted with acetic anhydride at room temperature in the presence of sodium bicarbonate to produce corresponding esters in good to excellent yields.
F. N. Lugemwa, K. Shaikh, Edwin Hochstedt   +2 more
semanticscholar   +1 more source

Rational Development of a Novel Emulgel Adjuvant for Single‐Shot Effective Vaccination: A Multivariate Analysis Approach

Advanced Materials, EarlyView.
Using multivariate analysis, a novel emulgel adjuvant is developed by combining key nanoemulsion formulation variables–hydrogel trapping, small globule size, and mannide monooleate surfactant–achieving 10× greater immunogenicity than MF59 in mice after a single shot.
Ahmed O. Shalash, Waleed M. Hussein, Ummey J. Nahar, Jingwen Wang, Lantian Lu, Armira Azuar, Jolynn J. E. Kiong, Prashamsa Koirala, Zeinab G. Khalil, Istvan Toth   +9 more
wiley   +1 more source

Synthesis of carbonyl compounds dibenzo-18- crown-6 by the Grinard reaction [PDF]

BIO Web of Conferences
In this article, Grignard reactions of 4´,4´´-diiododibenzo-18- crown-6 were carried out to obtain carbonyl compounds in an inert argon atmosphere. An aldehyde, 4´,4´´-diformyldiioddibenzo-18-crown-6, and a ketone, 4´,4´´-diacetyldibenzo-18-crown-6, were
Kozinskaya Lyubov, Mirkhamitova Dilorom, Atakulova Nargiza, Juraev Vays, Kuchkarova Noila, Rifky Mohamed   +5 more
doaj   +1 more source