Results 51 to 60 of about 142,813 (213)
Bi-acylation of cellulose: determining the relative reactivities of the acetyl and fatty-acyl moieties [PDF]
, 2011 The global reaction between acetic anhydride and a fatty acid yields, at equilibrium, an asymmetric acetic-aliphatic anhydride in a medium containing finally: acetic-fatty anhydride, acetic anhydride, fatty acid, acetic acid and fatty anhydride.
Borredon, Marie-Elisabeth +2 more
core +2 more sources
Advanced Materials InterfacesThiourea derivatives are typical additives that exert different steric hindrance effects on the tensile strength of electrolytic copper foil (ECF). However, the underlying mechanisms remain unclear.
Mingwei Chen +8 more
doaj +1 more source
EPR Study of Spin Labeled Brush Polymers in Organic Solvents [PDF]
, 2011 Spin-labeled polylactide brush polymers were synthesized via ring-opening metathesis polymerization (ROMP), and nitroxide radicals were incorporated at three different locations of brush polymers: the end and the middle of the backbone, and the end of ...
Burts, Alan O. +7 more
core +2 more sources
Kinetic Parameters of Biomass Pyrolysis by TGA
BioResources, 2016 Pyrolysis processes of typical biomass, such as corn stalk and birch chips, were investigated by thermogravimetric analysis (TGA). The apparent activation energy and pre-exponential factor were calculated with the adoption of the improved Coats-Redfern ...
Ming Zhai +5 more
doaj +1 more source
RNA polymerase interactions and elongation rate
, 2018 We show that non-steric molecular interactions between RNA polymerase (RNAP) motors that move simultaneously on the same DNA track determine strongly the kinetics of transcription elongation.
Belitsky, V., Schütz, G. M.
core +1 more source
Transferring Axial Molecular Chirality Through a Sequence of On-Surface Reactions
, 2020 Fine management of chiral processes on solid surfaces has progressed over the years, yet still faces the need for the controlled and selective production of advanced chiral materials.
Berdonces-Layunta, Alejandro +8 more
core +1 more source
Steric Hindrance and Geometrical Isomerism [PDF]
Nature, 1934 IT is not often that evidence in the form of steric hindrance is available for confirming the configurations of geometrical isomers among ethylenic compounds. The following observations are thus of interest. cis--Dibromocinnamic acid1 (m.p. 100°) esterifies to the extent of only 6 per cent in one hour, and 33 per cent in 16 hours, by the Fischer-Speier
openaire +1 more source
Nature Communications, 2023 Here, we present a proactive fouling prevention mechanism that endows superhydrophilic membranes with antifouling capability against migratory viscous crude oil fouling. By simulating the hierarchical architecture/chemical composition of a dahlia leaf, a
Yuanyuan Zhao +5 more
doaj +1 more source
Synthesis of Ni/NiAlOx Catalysts for Hydrogenation Saturation of Phenanthrene
Frontiers in Chemistry, 2021 The saturation of octahydrophenanthrene was the rate-determining step in the hydrogenation process from phenanthrene to perhydrophenanthrene, which was due to the steric hindrance and competitive adsorption of octahydrophenanthrene.
Dao-Cheng Liu +10 more
doaj +1 more source
The first solvent-free cyclotrimerization reaction of arylethynes catalyzed by rhodium porphyrins [PDF]
, 2003 Different rhodium(III) porphyrin chlorides have been used as catalysts for the cyclotrimerization of several arylethynes, giving in many cases high yields in substituted benzenes and selectivities based on the steric hindrance of the macrocycles and on ...
D'Arcangelo, G +4 more
core +1 more source