Results 241 to 250 of about 75,274 (292)
Some of the next articles are maybe not open access.
2022
Thiophenes are sulfur-containing aromatic heterocycles, the simple derivatives of which are stable liquids. Unlike their nitrogen-containing analogues, thiophene-containing compounds rarely occur in plants and have no role in the metabolism of animals.
openaire +1 more source
Thiophenes are sulfur-containing aromatic heterocycles, the simple derivatives of which are stable liquids. Unlike their nitrogen-containing analogues, thiophene-containing compounds rarely occur in plants and have no role in the metabolism of animals.
openaire +1 more source
Organic Letters, 2013
Three convergent routes to thiophenes are described, hinging on the radical addition of α-xanthyl ketones to ethyl vinyl sulfide or to vinyl pivalate. The latter route ultimately proved to be the most versatile and efficient (61-94%).
Jullien, Hélène +3 more
openaire +3 more sources
Three convergent routes to thiophenes are described, hinging on the radical addition of α-xanthyl ketones to ethyl vinyl sulfide or to vinyl pivalate. The latter route ultimately proved to be the most versatile and efficient (61-94%).
Jullien, Hélène +3 more
openaire +3 more sources
Radiation-Driven Destruction of Thiophene and Methyl-Substituted Thiophenes
AstrobiologyThiophene and two derivatives (2-methylthiophene and 3-methylthiophene) have been detected on the surface of Mars with the Sample Analysis at Mars instrument suite onboard NASA's Curiosity rover. Thiophene could serve as a secondary chemical biosignature since the secondary biosynthesis of thiophene is considered an important production pathway ...
Patrick D. Tribbett +4 more
openaire +2 more sources
Bis(ferrocenylsilyl)thiophenes and ferrocenylene(silylene)thiophene oligomers
Polyhedron, 2000Abstract The reaction between 1,1′-dilithioferrocene and 2,5-bis(chlorodimethylsilyl)thiophene ( I ), leads to a series of cyclic oligomers of basic formulation [Fc-SiMe 2 -TH-SiMe 2 ] n ( II ); Fc=(η 5 -C 5 H 4 ) 2 Fe, TH=C 4 H 2 S. The material n =2, IIa , has been completely characterized by spectroscopic and single crystal X-ray diffraction.
Keith H. Pannell +3 more
openaire +1 more source
Chapter 5 Thiophenes and benzo[b]thiophenes
2007Publisher Summary Thiophene is a useful template for four-carbon homologation via reduction, as well as a bioisostere of the benzene ring and other heterocycles in medicinal chemistry. Thiophene is a π-electron-excessive heterocycle. It favors electrophilic substitution, which, similar to metalation, takes place preferably at the α-positions due to
openaire +1 more source
An overview of benzo[b]thiophene-based medicinal chemistry.
European journal of medicinal chemistry, 2017R. Keri +5 more
semanticscholar +1 more source
Fresenius' Zeitschrift f�r Analytische Chemie, 1955
H. Freytag, Irmgard Schweitzer, J. Rasch
openaire +1 more source
H. Freytag, Irmgard Schweitzer, J. Rasch
openaire +1 more source
Supramolecular Thiophene Nanosheets
Angewandte Chemie, 2013Zheng, Y. +8 more
openaire +3 more sources