Merging shuttle reactions and paired electrolysis for reversible vicinal dihalogenations
作者:Xichang Dong、Johannes L. Roeckl、Siegfried R. Waldvogel、Bill Morandi
DOI:10.1126/science.abf2974
日期:2021.1.29
shuttle (e-shuttle) paradigm for the facile and scalable interconversion of alkenes and vicinal dihalides, a class of reactions that can be used both to synthesize useful dihalogenated molecules from simple alkenes and to recycle waste material through retro-dihalogenation. The reaction is demonstrated using 1,2-dibromoethane, as well as 1,1,1,2-tetrachloroethane or 1,2-dichloroethane, to dibrominate or
Ambident electrophilic character of thioxophosphoranesulphenyl bromides =P(S)SBr. A novel observation of electrophilic addition to a Carbon–Carbon double bond
The thioxophosphoranesulphenylbromides (1) act as ambident electrophiles towards alkenes and react, depending on the structure of the alkene, to give either the normal addition products –SC(R1)(R2)CR3(R4)(Br) or 1,2-dibromides and -disulphides.
Reactions of carboxamides with vinylsilanes under oxidative conditions
作者:Vera V. Astakhova、Mikhail Yu. Moskalik、Bagrat A. Shainyan
DOI:10.1016/j.jorganchem.2021.122230
日期:2022.2
The reactions of acetamide, benzamide and trifluoroacetamide with trimethyl(vinyl)-, triphenyl(vinyl)-, dimethyl(divinyl)- and diphenyl(divinyl)silanes in the presence of oxidants (t-BuOCl + NaI) or N-bromosuccinimide (NBS) in acetonitrile have been studied. Generally, all unsaturated silanes react with trifluoroacetamide to give the products of haloamidation, whereas with acetamide or benzamide the
Solvent interception, heterocyclization and desilylation upon NBS-induced sulfamidation of trimethyl(vinyl)silane
作者:Vera V. Astakhova、Mikhail Yu. Moskalik、Bagrat A. Shainyan
DOI:10.1039/c9ob01689a
日期:——
The reaction of trimethyl(vinyl)silane with sulfonamides in the presence of N-bromosuccinimide was shown to proceed regioselectively in methylene chloride under mild conditions and led to the products of bromosulfamidation in up to 88% yield. The obtained adducts undergo base-promoted dehydrobromination to give 2-trimethylsilyl-N-sulfonyl aziridines in a close to quantitative yield. In the reaction
Thermal Rearrangements of Spiro[2.4]hepta-1,4,6-trienes
作者:W. E. Billups、Rajesh K. Saini、Vladislav A. Litosh、Lawrence B. Alemany、William K. Wilson、Kenneth B. Wiberg
DOI:10.1021/jo011144e
日期:2002.6.1
Thermolysis of spiro[2.4]hepta-1,4,6-triene (1a) at 50 degrees C yielded bicyclo[3.2.0]hepta-1,3,6-triene (5), which dimerized in two different fashions to form cyclobutanes. The 1,2-dimethyl and 1-propyl derivatives of 1a also rearranged at 50 degrees C, but at a faster rate, each yielding a pair of cyclobutane dimers. The structures of these symmetrical dimers were investigated by 1D and 2D NMR and