Results 61 to 70 of about 12,722 (248)

Sampling and analyses of polychlorinated dibenzo dioxins (PCDDs) and polychlorinated dibenzo furans (PCDFs) emissions in South Africa: A practitioner’s guide

Clean Air Journal, 2016
Dioxins and furans are toxic chemicals. A draft report released for public comment in September 1994 by the US Environmental Protection Agency clearly describes dioxin as a serious public health threat.
D.L. Posthumus, G.B. Woollatt
doaj   +1 more source

A Diels–Alder probe for discovery of natural products containing furan moieties

Beilstein Journal of Organic Chemistry
Natural products (NPs) are fantastic sources of inspiration for novel pharmaceuticals, oftentimes showing unique bioactivity against interesting targets.
Alyssa S. Eggly, Namuunzul Otgontseren, Carson B. Roberts, Amir Y. Alwali, Haylie E. Hennigan, Elizabeth I. Parkinson   +5 more
doaj   +1 more source

Gold(I)-catalyzed formation of furans from γ-acyloxyalkynyl ketones

Beilstein Journal of Organic Chemistry, 2013
Various γ-acyloxyalkynyl ketones were efficiently converted into highly substituted furans with 2.5 mol % of triflimide (triphenylphosphine)gold(I) as a catalyst in dichloroethane at 70 °C.
Marie Hoffmann, Solène Miaskiewicz, Jean-Marc Weibel, Patrick Pale, Aurélien Blanc   +4 more
doaj   +1 more source

Novel carbocationic rearrangements of 1-styrylpropargyl alcohols

Beilstein Journal of Organic Chemistry, 2015
The dehydration and subsequent cyclization reactions of 1-styrylpropargyl alcohols was examined. In the course of these studies, numerous scaffolds were synthesized, including a furan, a cyclopentenone, an acyclic enone and even a naphthalenone.
Christine Basmadjian, Fan Zhang, Laurent Désaubry   +2 more
doaj   +1 more source

Changes during the extrusion of semolina in mixture with sugars

Czech Journal of Food Sciences, 2001
Wheat semolina and its mixtures with 5% glucose, fructose of sucrose were processed in a sigle screw extruder at the maximum temperature of 140°C and the processing time of 30 s.
A. Farouk Mansour, F. Pudil, V. Janda, J. Pokorný   +3 more
doaj   +1 more source

Embedding Chemistry and Pharmacy Into Sustainability

Angewandte Chemie International Edition, EarlyView.
Chemistry and pharmacy provide products and processes that are indispensable for our high living standard. To understand their relationship with sustainability is important to allow them to contribute to sustainability in a sustainable manner. An integrated overview of green, circular, and sustainable chemistry and pharmacy is given and how they have t
Klaus Kümmerer
wiley   +1 more source

Volatile Composition of Smoked and Non-Smoked Iranian Rice

Foods, 2016
In this work, the volatile profiles of smoked and non-smoked Iranian rice were identified, and their relative abundance was calculated and compared. Headspace solid-phase microextraction together with gas chromatography-mass spectrometry (SPME-GC-MS ...
Leontina Lipan, Mohammad Hojjati, Hussein El-Zaeddi, Lucía Sánchez-Rodríguez, Ángel Antonio Carbonell-Barrachina   +4 more
doaj   +1 more source

Gold-Catalyzed Propargylic Substitution Followed by Cycloisomerization in Ionic Liquid: Environmentally Friendly Synthesis of Polysubstituted Furans from Propargylic Alcohols and 1,3-Dicarbonyl Compounds

Molecules
Gold-catalyzed propargylic substitution of propargylic alcohols 1 with 1,3-dicarbonyl compounds 2 followed by cycloisomerization in ionic liquid enables the environmentally friendly synthesis of polysubstituted furans 3 in good-to-high yields.
Hitomi Chiaki, Yoshimitsu Hashimoto, Nobuyoshi Morita   +2 more
doaj   +1 more source

Rapid pseudo five-component synthesis of intensively blue luminescent 2,5-di(hetero)arylfurans via a Sonogashira–Glaser cyclization sequence

Beilstein Journal of Organic Chemistry, 2014
2,5-Di(hetero)arylfurans are readily accessible in a pseudo five-component reaction via a Sonogashira–Glaser coupling sequence followed by a superbase-mediated (KOH/DMSO) cyclization in a consecutive one-pot fashion. Besides the straightforward synthesis
Fabian Klukas, Alexander Grunwald, Franziska Menschel, Thomas J. J. Müller   +3 more
doaj   +1 more source

Photogenerated Oxetanes as a Gateway to Uphill Cyclopropanation

Angewandte Chemie International Edition, EarlyView.
An atom‐economical route to densely functionalized cyclopropanes from furans and photochemically activated aldehydes is enabled by a unique oxetane‐to‐cyclopropane rearrangement. These cyclopropanes can be used to access complex bioactive scaffolds and serve as a platform for asymmetric cyclopropane synthesis.
Tim Köglmeier, Thomas J. Tiefel, Oliver Reiser   +2 more
wiley   +1 more source