Results 21 to 30 of about 6,792 (286)
Blends of styrene-butadiene-styrene triblock copolymer with random styrene-maleic anhydride copolymers [PDF]
Macromolecular Chemistry and Physics, 2002 Blends of styrene-butadiene-styrene triblock copolymer (SBS) with random styrene-maleic anhydride copolymers (PS-co-MA), having different MA content, were prepared in a Brabender Plastigraph mixer. The presence of polystyrene (PS) blocks in the SBS copolymer and the high styrene content (93 and 86 wt.-%, respectively) in the two kinds of used PS-co-MA ...
PICCHIONI F. +4 more
openaire +5 more sources
Torsional Barriers for Planar versus Twisted Singlet Styrenes
, 2016 Kinetic modeling of the temperature-dependent lifetimes of styrene and several methyl-substituted styrenes has been used to obtain the torsional barriers for singlet-state CC rotation.
Frederick D. Lewis (1278270) +1 more
core +2 more sources
Molecules, 2003 The novel 2-aryl-3a,4,12,12a-tetrahydropyrrolo[3',4':4,3]-pyridazino[6,1-b]-quinazoline-1,3,6-triones (6a–d), 2-aryl-10-oxopyridazino[6,1-b]-quinazoline-3-thio-carboxamides (10a–d) and 2-aryl-3-nitro-1,2,3,4-tetrahydro-pyridazino[6,1-b ...
Hatem M. Gaber, Sami S. Ghabrial
doaj +1 more source
Organocatalytic atroposelective synthesis of axially chiral styrenes
Nature Communications, 2017 Many methods exist for the atroposelective synthesis of axially chiral biaryls, but axially chiral styrenes are much less explored. Here the authors report an organocatalytic procedure for the synthesis of configurationally stable, axially chiral ...
Sheng-Cai Zheng +5 more
doaj +1 more source
Nickel(0)-Catalyzed Linear-Selective Hydroarylation of Unactivated Alkenes and Styrenes with Arylboron Acids [PDF]
, 2018 Herein, we realized the first linear-selective hydroarylation of unactivated alkenes and styrenes with organoboronic acids by introducing directing groupon alkenes.
Li-Jun, Xiao +3 more
core +2 more sources
Palladium-catalyzed regio- and enantioselective migratory allylic C(sp3)-H functionalization
Nature Communications, 2021 Alkene isomerizations and asymmetric C–H functionalizations have been independently studied, but their combination in one protocol is uncommon. Here the authors show a palladium-catalyzed method to iteratively “walk” a terminal alkene along a carbon ...
Ye-Wei Chen +4 more
doaj +1 more source
Hydroxy- and Hydro-Perfluoroalkylation of Styrenes by Controlling the Quenching Cycle of Eosin Y
Molecules, 2023 Fluoroalkyl compounds are widely used, underscoring a pressing need for the development of methods for their synthesis. However, reports on perfluoroalkylation to styrenes have been sparse.
Haruko Shibata +4 more
doaj +1 more source
Mechanochemical Piezoelectric Catalysis: Advancing the Hydrogenation of Alkenes. [PDF]
Adv Sci (Weinh)This study presents mechanochemical piezoelectric catalysis for alkene hydrogenation, eliminating the need for transition metals, H2, and solvents. The method effectively hydrogenates diverse activated and unactivated alkenes and shows potential for modifying bioactive molecules in pharmaceuticals.
Ai Z +5 more
europepmc +2 more sources
Nature Communications, 2023 Direct synthesis of ketones from aldehydes features high atom- and step-economy. Yet, the coupling of aldehydes with unactivated alkyl C(sp3)-H remains challenging.
Hai-Ying Wang +4 more
doaj +1 more source
Reactions of 3-aryl-1-(trifluoromethyl)prop-2-yn-1-iminium salts with 1,3-dienes and styrenes
Beilstein Journal of Organic Chemistry, 2020 3-Aryl-1-(trifluoromethyl)prop-2-yn-1-iminium triflate salts represent a novel, highly reactive class of acetylenic iminium salts. Herein we present several reactions which are based on the electron-poor acetylenic bond and on the high electrophilicity ...
Thomas Schneider +3 more
doaj +1 more source