Ligand free, highly efficient synthesis of diaryl ether over copper fluorapatite as heterogeneous reusable catalyst
作者:Shafeek A.R. Mulla、Suleman M. Inamdar、Mohsinkhan Y. Pathan、Santosh S. Chavan
DOI:10.1016/j.tetlet.2012.01.124
日期:2012.4
A novel ligand-free, highlyefficient, and an inexpensive method has been developed by using ecofriendly, heterogeneous reusable copper fluorapatite (CuFAP) catalyst for the synthesis of diaryl ethers from the cross coupling reaction of the various substituted aryl halides (fluoride, chloride, bromide, and iodide) with the potassium salts of various substituted phenols in the presence of N-methyl 2-pyrrolidone
Process for carboxylating organic substrates with carbon dioxide in
申请人:Montedison S.p.A.
公开号:US03976677A1
公开(公告)日:1976-08-24
Carboxylable substrates i.e., ketones, esters, nitroparaffins and nitriles, containing activated hydrogen atoms are carboxylated by reaction with alkaline phenates and CO.sub.2 in at least one hydrocarbon solvent selected from aliphatic, alicyclic, aromatic and alkyl-aromatic hydrocarbon solvents.
The nucleophilic substitution reactions of hindered 2,2-diethylbutyl methanesulfonate with potassium aryloxides were carried out in dimethyl sulfoxide at higher temperatures. New unrearranged hindered ethers were readily obtained in excellent yields as the desired products.
Synthesis, Structure, and Reactivity of Anionic sp<sup>2</sup>-sp<sup>3</sup>Diboron Compounds: Readily Accessible Boryl Nucleophiles
作者:Sabrina Pietsch、Emily C. Neeve、David C. Apperley、Rüdiger Bertermann、Fanyang Mo、Di Qiu、Man Sing Cheung、Li Dang、Jianbo Wang、Udo Radius、Zhenyang Lin、Christian Kleeberg、Todd B. Marder
DOI:10.1002/chem.201500235
日期:2015.5.4
Lewis bases, such as alkoxides and fluoride. The study was extended to alternative Lewisbases, such as acetate, and other diboron reagents. The B(sp2)–B(sp3) adducts exhibit two distinct boron environments in the solid‐state and solution NMR spectra, except for [(4‐tBuC6H4O)B2pin2]−, which shows rapid site exchange in solution. DFT calculations were performed to analyze the stability of the adducts with
Synthesis of 6<i>H-</i>Benzo[<i>c</i>]chromene Scaffolds from <i>O</i>-Benzylated Phenols through a C–H Sulfenylation/Radical Cyclization Sequence
作者:Steve Karreman、Simon B. H. Karnbrock、Sebastian Kolle、Christopher Golz、Manuel Alcarazo
DOI:10.1021/acs.orglett.1c00087
日期:2021.3.19
S-Aryl dibenzothiophenium salts, obtained through a highly regioselective C–H sulfenylation of o-benzyl-protected phenols, are used as precursors of 6H-benzo[c]chromenes. The reaction starts with a photocatalytically triggered single-electron transfer to the sulfonium salt, which promotes the formation of an arylradical via selective mesolitic cleavage of the S–Arexo bond. Mechanistic studies reveal
S-芳基二苯并噻吩鎓盐是通过邻苯甲基保护的苯酚的高区域选择性 C-H 亚磺酰化获得的,用作 6 H-苯并[ c ]色烯的前体。该反应从光催化触发的单电子转移到锍盐开始,这通过选择性中间体裂解 S-Ar外键促进芳基自由基的形成。机理研究表明,这种最初的自由基物种遵循动力学有利的 5-exo-trig 途径循环。随后的环扩展,有利于重芳构化,提供所需的三环系统。