Results 31 to 40 of about 2,928 (218)

Keggin-Type Heteropolyacids-Catalyzed One Pot Oxidation-Trimerization of Alcohols into 2,4,6-Trisubstituted-1,3,5-Trioxanes [PDF]

Iranian Journal of Chemistry & Chemical Engineering, 2009
The catalytic air oxidation-trimerization of alcohols was carried out with hetropolyacids. In the presence of hetropolyacid formation of cyclotrimers of alcohols and aldol condensation products was observed.
M. Majid Heravi, Sodeh Sadjadi, Rahim Hekmatshoar, Hossein Abdi Oskooie, Fatemeh Bamoharram   +4 more
doaj  

Dual iron- and organophotocatalyzed hydroformylation, hydroacylation and hydrocarboxylation of Michael-acceptors utilizing 1,3,5-trioxanes as C1-Synthone

Tetrahedron Chem
A protocol based on photocatalytic cycles of both iron(III)chloride and 9,10-dicyanoanthracene (DCA) is developed for the masked hydroformylation, hydroacylation, and hydrocarboxylation of Michael-Acceptors utilizing readily available 1,3,5-trioxanes ...
Viktor Klöpfer, Anurag Chinchole, Oliver Reiser   +2 more
doaj   +1 more source

A kinetic and mechanistic study on the thermal decomposition reactions of cis- and trans- fused 1,2,4-trioxanes [PDF]

, 2020
The kinetics of the thermal decomposition reactions of artemisinine (1), a cis-fused 1,2,4-trioxane, and trans-3,3dimethyl-1,2,4-trioxane (6) in solutions of benzene, toluene, and methanol in sealed tubes were compared at temperatures between 100.1° and ...
Cafferata, Lázaro F. R., Jeandupeax, Rene, Jefford, Charles W., Mateo, Carmen Margarita, Romanelli, Gustavo Pablo   +4 more
core   +2 more sources

Antimalarial sulfide, sulfone, and sulfonamide trioxanes

Bioorganic & Medicinal Chemistry, 2000
A series of trioxanes featuring sulfide, sulfone, and sulfonamide substituents in diverse positions has been prepared. Structure-activity relationship (SAR) generalizations highlight two major factors controlling the antimalarial potency of these new chemical entities: (1) the proximity of the sulfur-containing substituent to the crucial peroxide bond ...
G H, Posner, J P, Maxwell, H, O'Dowd, M, Krasavin, S, Xie, T A, Shapiro   +5 more
openaire   +2 more sources

Structure–activity relationships of the antimalarial agent artemisinin 10. Synthesis and antimalarial activity of enantiomers of rac-5β-hydroxy-d-secoartemisinin and analogs: Implications regarding the mechanism of action [PDF]

, 2021
An efficient synthesis of rac-6-desmethyl-5β–hydroxy-D-secoartemisinin 2, a tricyclic analog of R-(+)-artemisinin 1, was accomplished and the racemate was resolved into the (+)-2b and (−)-2a enantiomers via their Mosher Ester diastereomers.
Elokely, Khaled M., Fronczek, Frank R., Jahan, Mohamed, Leon, Francisco   +3 more
core   +2 more sources

Cinètica de la reacció de descomposició tèrmica de l’ascaridol en dissolució [PDF]

, 2005
Existen diferencias entre los valores de algunas propiedades físicas de ascaridol natural aislado del vegetal denominado vulgarmente «Paico» (Chenopodium ambrosioides L., Chenopodiaceae) y la sustancia sintética obtenida mediante la reacción de ...
Cafferata, Lazaro, Cañizo, Adriana Ines, Jeandupeux, R.   +2 more
core   +1 more source

Chain‐End Grafting of RAFT Polyelectrolyte Macroligands to Stabilize Near‐Infrared‐Emitting Gold Nanoclusters

Macromolecular Rapid Communications, EarlyView.
Surface‐functionalized gold nanoclusters (AuNCs) are synthesized in situ by chain‐end grafting of RAFT polyelectrolytes at room temperature directly in water. It leads to highly stable polymer‐AuNCs nanohybrids emitting near‐infrared photoluminescence with µs lifetimes. ABSTRACT With their photoluminescence properties, gold nanoclusters (AuNCs, d<2 nm)
Bárbara Casteleiro, Pierre Alcouffe, Fernande Da Cruz, Agnès Crépet, José Manuel Gaspar Martinho, Marie‐Thérèse Charreyre, José Paulo Sequeira Farinha, Arnaud Favier   +7 more
wiley   +1 more source

Electronic Smoking Devices Among University Students: Usage Patterns and Chemical Composition of Inhaled Substances

Analytical Science Advances, Volume 7, Issue 1, June 2026.
ABSTRACT This study investigated the prevalence of electronic smoking device (ESD) use and its associated behavioural and chemical risks among university students in Bahia, Brazil. A cross‐sectional survey was conducted with 355 students from public and private institutions through an online questionnaire between April and May 2023. Among participants,
Eduard F. Valenzuela, Raffael Silva Santos Almeida, Ivana Ferreira Simões, Aline Gonçalves Miranda, Magno Oliveira Ramos, Roberto Rodrigues Bandeira Tosta Maciel, Fernanda Warken Rosa, Aníbal de Freitas Santos Júnior   +7 more
wiley   +1 more source

Artemisinin: From Chinese Herbal Medicine to Modern Chemotherapy [PDF]

, 2019
Malaria is a disease that has blighted humankind since early times. The first antimalarial treatment available to Europeans was the dried bark of the cinchona tree from Peru. The main problem in its use was adulteration by other material.
Butler, Anthony
core   +1 more source

Fluoro‐Functionalized Polyether Electrolytes Enabling High‐Energy‐Density Solid‐State Lithium‐Metal Batteries

ENERGY &ENVIRONMENTAL MATERIALS, Volume 9, Issue 3, May 2026.
Fluoro‐functionalized polyether electrolytes, which combine fluorine‐ and ether‐containing groups, achieve enhanced oxidative stability, high ionic conductivity, and superior interfacial stability. Due to their non‐flammability, remarkable flexibility, ease of processing, and design versatility, polymer‐based electrolytes containing polyethers have ...
Nannan Geng, Chenkai Lu, Wenbei Li, Qianxin Liu, Zixuan Zhou, Tao Yang, Yin Cui, Guobin Zhang, Xidong Lin   +8 more
wiley   +1 more source