Halogenation of thiocarboxylic acid O-silyl esters gave acylsulfenyl halides in high yields, involving a thiophilic attack of halogen ion on the sulfur atom of thiocarbonyl group. Aliphatic acylsulfenyl bromide was isolated for the first time.
An enantioconvergent halogenophilic nucleophilic substitution (S
<sub>N</sub>
2X) reaction
作者:Xin Zhang、Jingyun Ren、Siu Min Tan、Davin Tan、Richmond Lee、Choon-Hong Tan
DOI:10.1126/science.aau7797
日期:2019.1.25
bromine from the front. Bimolecular nucleophilic substitution (SN2) plays a central role in organic chemistry. In the conventionally accepted mechanism, the nucleophile displaces a carbon-bound leaving group X, often a halogen, by attacking the carbon face opposite the C–X bond. A less common variant, the halogenophilic SN2X reaction, involves initial nucleophilic attack of the X group from the front
A Convenient Synthesis of<i>Se</i>-Aryl Oxoarylmethanesulfenoselenoates and<i>Te</i>-Aryl Oxoarylmethanesulfenotelluroates: Electrophilic Thiocarboxylation of Diaryl Diselenides and Ditellurides