Results 11 to 20 of about 596,435 (207)
Production of Metal-Free Diamond Nanoparticles [PDF]
ACS Omega, 2018 In this paper, the controlled production of high quality metal-free diamond nanoparticles is demonstrated. Milling with tempered steel is shown to leave behind iron oxide contamination which is difficult to remove. Milling with SiN alleviates this issue but generates more non diamond carbon. Thus the choice of milling materials is critically determined
Laia Ginés +7 more
openaire +10 more sources
Beilstein Journal of Organic Chemistry, 2021 A simple and efficient method for α-brominating lactones that affords α-bromolactones under mild conditions using tetraalkylammonium hydroxide (R4N+OH−) as a base was developed.
Yuki Yamamoto +7 more
doaj +1 more source
Metal-free syn-dioxygenation of alkenes [PDF]
, 2013 Reactions employing inexpensive reagents from sustainable sources and with low toxicity are becoming increasingly desirable from an academic and industrial perspective.
Ashikari +60 more
core +1 more source
Triggering redox activity in a thiophene compound: radical stabilization and coordination chemistry [PDF]
, 2006 The synthesis, metalation, and redox properties of an acyclic bis(iminothienyl)methene L− are presented. This π-conjugated anion displays pronounced redox activity, undergoing facile one-electron oxidation to the acyclic, metal-free, neutral radical L ...
Davison +46 more
core +2 more sources
Effect of building block transformation in covalent triazine‐based frameworks for enhanced CO2 uptake and metal‐free heterogeneous catalysis [PDF]
, 2020 Invited for the cover of this issue is the group of Pascal Van Der Voort at the University of Ghent and colleagues at Technische Universitat Berlin. The image depicts the covalent triazine frameworks reported in the manuscript for the sorption of CO2 and
Jena, Himanshu +5 more
core +2 more sources
Frontiers in Chemistry, 2022 Hypervalent iodine reagents have been applied in many metal-free, efficient synthesis of natural products and other bioactive compounds. In particular, treatment of alcohols, acetals and acids with hypervalent iodine reagents and iodine results in O ...
Marina Porras +3 more
doaj +1 more source
The Spatial Distribution of the Galactic First Stars II: SPH Approach [PDF]
, 2006 We use cosmological, chemo-dynamical, smoothed particle hydrodynamical simulations of Milky-Way-analogue galaxies to find the expected present-day distributions of both metal-free stars that formed from primordial gas and the oldest star populations.
Brad K. Gibson +8 more
core +2 more sources
Evolution and Nucleosynthesis of Metal-Free Massive Stars [PDF]
, 1999 We calculate presupernova evolutions and supernova explosions of massive stars (M=13-25 Mo) for various metallicities. We find the following characteristic abundance patterns of nucleosynthesis in the metal-free (Pop III) stars.
Nakamura, Takayoshi +2 more
core +2 more sources
First Metal-Free Synthesis of Tetracyclic Pyrido and Pyrazino Thienopyrimidinone Molecules
Molecules, 2018 We report herein a new metal free synthetic pathway to generate tetracyclic compounds from 3-aminothieno[3,2-b]pyridine-2-carboxylate. To enlarge the molecular diversity, we studied the Suzuki coupling of 9-chloro-6H-pyrido[1,2-a]pyrido[2′,3′:4,5]thieno ...
Mohammed Aounzou +3 more
doaj +1 more source
Metal-free photo-induced sulfidation of aryl iodide and other chalcogenation
Frontiers in Chemistry, 2022 A photo-induced C-S radical cross-coupling of aryl iodides and disulfides under transition-metal and external photosensitizer free conditions for the synthesis of aryl sulfides at room temperature has been presented, which features mild reaction ...
Shuai Mao +12 more
doaj +1 more source