Results 31 to 40 of about 2,222 (186)

Ionic liquid–driven pyran synthesis: Pathways and perspectives

Journal of Ionic Liquids
Pyrans and their fused derivatives are privileged oxygen heterocycles with broad biological activity and industrial relevance, yet their sustainable synthesis remains a continuing challenge.
Pravas Maity, Amrit Krishna Mitra
doaj   +1 more source

Recent Advances in the Synthesis of 2H-Pyrans

Molecules, 2019
In this review, we discuss the nature of the different physicochemical factors affecting the valence isomerism between 2H-pyrans (2HPs) and 1-oxatrienes, and we describe the most versatile synthetic methods reported in recent literature to access to 2HPs,
David Tejedor, Samuel Delgado-Hernández, Raquel Diana-Rivero, Abián Díaz-Díaz, Fernando García-Tellado   +4 more
doaj   +1 more source

Oxidation of Aryl Alcohols by Morpholinium Fluorochromate(VI) on Silica Gel, a Selective and Efficient Heterogeneous Reagent

E-Journal of Chemistry, 2011
Morpholinium fluorochromate(VI), MFC, is easily synthesized by reacting morpholine to an aqueous solution of CrO3 and HF. This reagent selectively oxidizes aryl alcohols to their corresponding aldehydes and ketones under mild conditions.
S. Zahra Sayyed-Alangi, H. Sajjadi-Ghotbabadi, Mohammed T. Baei, Sahar Naderi   +3 more
doaj   +1 more source

2-(2-(Dimethylamino)vinyl)-4H-pyran-4-ones as Novel and Convenient Building-Blocks for the Synthesis of Conjugated 4-Pyrone Derivatives

Molecules, 2022
A straightforward approach for the construction of the new class of conjugated pyrans based on enamination of 2-methyl-4-pyrones with DMF-DMA was developed.
Dmitrii L. Obydennov, Diana I. Nigamatova, Alexander S. Shirinkin, Oleg E. Melnikov, Vladislav V. Fedin, Sergey A. Usachev, Alena E. Simbirtseva, Mikhail Y. Kornev, Vyacheslav Y. Sosnovskikh   +8 more
doaj   +1 more source

[DMImd-DMP]: A highly efficient and reusable catalyst for the synthesis of 4H-benzo[b]pyran derivatives

Heterocyclic Communications, 2019
A series of substituted 4H-pyrans derivatives were synthesized by a one-pot, multi-component reaction of aromatic aldehydes, malononitrile, and pyrazolone derivatives or active methylene carbonyl compounds such as dimedone, in the presence of 1,3 ...
Redouane Mohamed Abdenour, Khiri-Meribout Naima, Benzerka Saida, Debache Abdelmadjid   +3 more
doaj   +1 more source

Magnetic silica/graphene oxide nanocomposite supported ionic liquid–manganese complex as a powerful catalyst for the synthesis of tetrahydrobenzopyrans

Scientific Reports, 2023
A novel magnetic silica/graphene oxide nanocomposite supported ionic liquid/manganese complex (Fe3O4@SiO2-NH2/GO/IL-Mn) is prepared, characterized and its catalytic application is investigated.
Farkhondeh Dadvar, Dawood Elhamifar
doaj   +1 more source

Design and application of a novel natural deep eutectic solvent as a green solvent and catalyst for the efficient synthesis of tetrahydrobenzo[b]pyrans

Heliyon
In this study, a novel natural deep eutectic solvent (NADES) composed of proline (HBA), choline chloride (HBA), glycerol (HBD) (1:1:6) was designed and utilized for the green synthesis of tetrahydrobenzo[b]pyrans.
Fatemeh Pirani, Hossein Eshghi
doaj   +1 more source

Comprehensive Characterization of Acer truncatum Leaf Extract: Identification of Systemic Metabolites and Effects on Performance, Antioxidant Status, and Intestinal Microbiota in Laying Hens

Animal Research and One Health, EarlyView.
Dietary A. truncatum leaf extract is absorbed and improves laying performance in aged hens by enhancing systemic antioxidant capacity and modulating the gut microbiota. ABSTRACT The demand for natural feed additives is considerably increasing in the antibiotic‐free feed era.
Kailong Qin, Jiantao Yang, Minglu Gao, Xiaozhao Tao, Xin Yang, Yanli Liu, Xiaojun Yang   +6 more
wiley   +1 more source

Fluorescent Diarylethenes With Polar Groups: Synthesis, Spectra, and Optical Microscopy Applications

Chemistry – A European Journal, EarlyView.
Blinking green and flashing red: photo‐switchable and photo‐activatable probes emitting green and red light were prepared and applied as bioconjugates in super‐resolution optical microscopy. ABSTRACT The use of photoactivatable fluorescent diarylethenes (fDAEs) in biology‐related light microscopy has been restricted by the lack of probes having freely ...
Kakishi Uno, Sven Nagorny, Ayse Aktalay, Dojin Kim, Mariano L. Bossi, Vladimir N. Belov, Stefan W. Hell   +6 more
wiley   +1 more source

Neue Versuche mit Spiropyran: Photometrie, NMR‐Spektroskopie und On‐Water‐Synthese

CHEMKON, EarlyView.
Reaktionskinetik wird häufig als schwierig, theoretisch und Mathematik‐lastig empfunden, weshalb experimentelle Zugänge für diesem Themenbereich notwendig sind. In diesem Beitrag werden entsprechende Versuche zur Reaktionskinetik vorgestellt, bei denen das Farbstoffsystem eines Spiropyrans und dessen isomerer Merocyanin‐Form untersucht wird.
Marcel Emmert, Jordan Karg, Katja Flora Weirauch   +2 more
wiley   +1 more source