Results 11 to 20 of about 540,123 (267)
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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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
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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
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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
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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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Beilstein Journal of Organic Chemistry, 2023 An operationally simple and metal-free approach is described for the synthesis of pyrazole-tethered thioamide and amide conjugates. The thioamides were generated by employing a three-component reaction of diverse pyrazole C-3/4/5 carbaldehydes, secondary
Shubham Sharma +8 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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Frontiers in Chemistry, 2022 A convenient approach for the construction of pharmaceutically valuable 3-trifluoromethyl-1,2,4-triazoles has been developed, which employs the readily available trifluoroacetimidoyl chlorides, hydrazine hydrate and benzene-1,3,5-triyl triformate (TFBen)
Binjie Wang +7 more
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Dentistry Journal, 2022 Background: To analyze the fracture resistance of zirconia implants within the anterior region and evaluate whether zirconia–zirconia implants can be a viable alternative to titanium implants.
Lauryn Attard +6 more
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Metal Free Phosphorus Butterfly Compounds
European Journal of Inorganic Chemistry, 2020 AbstractMetal‐free organophosphorus are demanded compounds due to their interesting properties in a variety of applications, spanning from fine to material chemistry. Unfortunately, their synthesis is very challenging, requiring a precise design of the reaction conditions to avoid the conspicuous formation of undesired products.
Franco Scalambra, Antonio Romerosa
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