Results 71 to 80 of about 41,598 (291)

Opium trade and use during the Late Bronze Age: Organic residue analysis of ceramic vessels from the burials of Tel Yehud, Israel

Archaeometry, EarlyView., 2022
Abstract Organic residue analysis was conducted on various vessels from burials at Tel Yehud, Israel. The analyses led to new reliable evidence for the presence of opioid alkaloids and their decomposition products. This research revitalizes a decades‐old discussion on the presence and function of the opium trade across a cultural region of utmost ...
Vanessa Linares, Eriola Jakoel, Ron Be’eri, Oded Lipschits, Ronny Neumann, Yuval Gadot   +5 more
wiley   +1 more source

Kinetics and mechanism of vanadium catalysed asymmetric cyanohydrin synthesis in propylene carbonate

Beilstein Journal of Organic Chemistry, 2010
Propylene carbonate can be used as a green solvent for the asymmetric synthesis of cyanohydrin trimethylsilyl ethers from aldehydes and trimethylsilyl cyanide catalysed by VO(salen)NCS, though reactions are slower in this solvent than the corresponding ...
Michael North, Marta Omedes-Pujol
doaj   +1 more source

Synthesis and Characterization of π‐Extended Azulenes via Nucleophilic Substitution and Intramolecular Cyclization of 5‐Alkynyl‐6‐Fluoroazulenes

ChemistryEurope, EarlyView.
A modular synthetic approach enables the preparation of azulene‐fused heterocycles via nucleophilic aromatic substitution followed by intramolecular cyclization of alkynyl fluoroazulenes. The method allows the incorporation of various heteroatoms (N, O, S, Se, and Te), leading to structurally diverse heteroannulated azulenes.
Martin C. Dietl, Matthias Scherr, Christopher Hüßler, Henrik T. Habeck, Carmen L. M. Henel, Jürgen Graf, Frank Rominger, Matthias Rudolph, A. Stephen K. Hashmi   +8 more
wiley   +1 more source

11-[Bis(trimethylsilyl)amino]-2,4-bis(trimethylsilyl)-7,8,9,10-tetrahydro-6H-cyclohepta[1,2-b]quinoline

IUCrData, 2017
In the title compound, C26H48N2Si4, the cycloheptane ring adopts a chair conformation, while the quinolinyl ring system is almost planar [maximum deviation = 0.040 (3) Å for one of the C atoms carrying a Me3Si group].
Ísmail Çelik, Mehmet Akkurt, Makbule Ekiz, Ahmet Tutar, Salih Ökten, Cem Cüneyt Ersanlı   +5 more
doaj   +1 more source

Easier, Safer, and Greener: Unlocking the Power of Solid Reagents in Organic Reactions by Mechanochemistry

ChemistryEurope, EarlyView.
This review highlights the powerful synergy between mechanochemistry and solid reagents to replace hazardous substances traditionally used in organic synthesis. Such an approach offers a safer and more sustainable pathway for conducting organic reactions, with potential benefits in both reactivity and selectivity. The use of solid bases, acids, and gas
Adrien Gallego, Nicolas Pétry, Julien Pinaud, Olivia Giani, Frédéric Lamaty   +4 more
wiley   +1 more source

Redox‐Dependent Luminescence in a Pentavalent Uranyl Complex

ChemistryEurope, EarlyView.
Redox‐dependent luminescence in a molecular pentavalent uranyl complex supported by a pyridine dipyrrolide pincer ligand is presented. Electrochemical and chemical reduction of the uranyl(VI) species provides a stable uranyl(V) complex that emits blue light from a high‐energy excited state. The anti‐Kasha emission is credited to the presence of “nested”
Leyla R. Valerio, Asmita Sen, William W. Brennessel, Carsten Milsmann, Jochen Autschbach, Ellen M. Matson   +5 more
wiley   +1 more source

Reactions of Trimethylsilyl Cyanide with Tropone, 2-Phenyltropone, and 2-Methoxytropone. Formations of 2-Cyano-1-hydroxytropylidene Derivatives [PDF]

, 1985
Katsuhiro Saito, Hisashi Kojima
openalex   +1 more source

Exploring Indium Teflates: From Neutral In(OTeF5)3(THF)3 to Anionic Complexes [In(OTeF5)4(THF)2]– and [In(OTeF5)6]3–

ChemistryEurope, EarlyView.
The study examines the coordination chemistry of indium teflate complexes, showing the progression from [In(OTeF5)3(THF)3] to the anionic species [In(OTeF5)4(THF)2]– and [In(OTeF5)6]3–. Systematic ligand substitution and anion formation reveal increasing teflate coordination, highlighting structural evolution, Lewis acidity modulation, and ...
Djamila Azrou, Lukas Fischer, Anja Wiesner, Aurélien Alix, Régis Guillot, Vincent Gandon, Sebastian Riedel, Christophe Bour   +7 more
wiley   +1 more source

Identification of 3 beta, 7 beta-dihydroxy-5 beta-cholan-24-oic acid in serum from patients treated with ursodeoxycholic acid.

Journal of Lipid Research, 1984
An unknown bile acid was found by gas-liquid chromatography in the serum of patients who were administered ursodeoxycholic acid for the treatment of cholesterol gallstones.
M Maeda, H Ohama, H Takeda, M Yabe, M Nambu, T Namihisa   +5 more
doaj   +1 more source

Tris(trimethylsilyl)silane/O₂-Promoted and Photo-accelerated Conversion of Alkyl Iodides to Alcohols [PDF]

, 2020
Jianyu Li, Jinlong Zeng, Jianfeng Chen, Baoguo Zhao   +3 more
openalex   +1 more source