Results 11 to 20 of about 4,159,820 (313)
Metal‐Free Catalytic Hydrogenation [PDF]
Angewandte Chemie, 2007 Hydrogenation is the addition of hydrogen to unsaturated organic compounds. Such reactions are used for the production of a myriad of chemical products worldwide, from largescale operations including the upgrading of crude oil and the production of bulk commodity materials to the synthesis of a variety of fine chemicals used in the food, agricultural ...
Chase, P A +3 more
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Triphenylborane in Metal-Free Catalysis
Molecules, 2023 The development and application of new organoboron reagents as Lewis acids in synthesis and metal-free catalysis have dramatically expanded over the past 20 years. In this context, we will show the recent uses of the simple and relatively weak Lewis acid BPh3—discovered 100 years ago—as a metal-free catalyst for various organic transformations.
Suresh Mummadi, Clemens Krempner
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METAL FREE CERAMICS: A REVIEW. [PDF]
International Journal of Advanced Research, 2018 For the last ten years, the application of high-technology processes to dental ceramics allowed for the development of new materials such as heat-pressed, injection-molded, and slip-cast ceramics and glass-ceramics. To select the most appropriate type of all-ceramic system for clinical use, the clinician must be familiar with the differences between ...
Avita Ursula Hycynth D-Almeida +3 more
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Nitrogen-Doped Graphene Oxide as Efficient Metal-Free Electrocatalyst in PEM Fuel Cells
Nanomaterials, 2023 Nitrogen-doped graphene is currently recognized as one of the most promising catalysts for the oxygen reduction reaction (ORR). It has been demonstrated to act as a metal-free electrode with good electrocatalytic activity and long-term operation ...
Adriana Marinoiu +3 more
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Metal-Free Chlorodeboronation of Organotrifluoroborates [PDF]
The Journal of Organic Chemistry, 2011 A mild and metal-free method for the chlorodeboronation of organotrifluoroborates using trichloroisocyanuric acid (TCICA) was developed. Aryl-, heteroaryl-, alkenyl-, alkynyl-, and alkyltrifluoroborates were converted into the corresponding chlorinated products in good yields. This method proved to be tolerant of a broad range of functional groups.
Gary A, Molander, Livia N, Cavalcanti
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Complex rehabilitation of traumatized permanent teeth in the aesthetic zone
Fogorvosi Szemle, 2021 The aim of this case study is to present our treatment method for the restoration of traumatic lesions of teeth following a bicycle accident. Four upper incisors were injured; thus, special consideration was required in timing of the treatment sequence ...
Réka Miklós, Róbert Kemper
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Precise Control of π-electron Magnetism in Metal-free Porphyrins [PDF]
, 2020 The porphyrin marcocycle can stabilize a set of magnetic metal ions, thus introducing localized net spins near the center. However, it remains illusive but most desirable to introduce delocalized spins in porphyrins with wide implications, for example ...
Shiyong, Wang +13 more
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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
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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
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Metal‐Free Electrocatalytic Diacetoxylation of Alkenes
Angewandte Chemie International Edition, 2023 Abstract1,2‐Dioxygenation of alkenes leads to a structural motif ubiquitous in organic synthons, natural products and active pharmaceutical ingredients. Straightforward and green synthesis protocols starting from abundant raw materials are required for facile and sustainable access to these crucial moieties.
Vanhoof, Jef R. +4 more
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