Gold-Catalyzed Ascorbic Acid-Induced Arylative Carbocyclization of Alkynes with Aryldiazonium Tetrafluoroborates was written by Medina-Mercado, Ignacio;Colin-Molina, Abraham;Barquera-Lozada, Jose Enrique;Rodriguez-Molina, Braulio;Porcel, Susana. And the article was included in ACS Catalysis in 2021.Related Products of 103-16-2 The following contents are mentioned in the article:
Herein, arylative carbocyclization of alkynes 2-R-4-R1-C6H3XCH2CCR2 (X = O, S, NTs; R = H, I; R1 = H, OMe, Br, Ph, etc.; R2 = n-Bu, Ph, thiophen-2-yl, etc.) catalyzed by gold was described. In this process, Au(I) is oxidized to Au(III) with aryldiazonium tetrafluoroborates R3C6H4N2BF4 (R3 = 4-NO2, 3-CN, 4-C(O)OEt, etc.) following a photosensitizer-free and irradiation-free protocol. Ascorbic acid acts as a radical initiator, generating aryl radicals. According to DFT calculations, these radicals are added to Au(I), leading to a Au(II) species that is further oxidized to Au(III) with the assistance of a tetrafluoroborate anion. The overall arylative carbocyclization process is very energetically favorable, transforming arylpropargyl ethers into valuable 3,4-diaryl-2H-chromenes I in a completely regio- and stereoselective fashion. Furthermore, one of the synthesized 3,4-diaryl-2H-chromenes I exhibits polymorphism with marked differences in the color of its crystals, a property that could lead to the development of colored derivatives in the future. This study involved multiple reactions and reactants, such as 4-Benzyloxyphenol (cas: 103-16-2Related Products of 103-16-2).
4-Benzyloxyphenol (cas: 103-16-2) belongs to ethers. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Related Products of 103-16-2
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem