作者:Scott E. Denmark、Thomas Vogler
DOI:10.1002/chem.200901377
日期:2009.11.2
Enantiomerically enriched thiiranium ion 5 has been prepared by silver‐assisted ionization of chloro sulfide 4 at −20 °C. This thiiranium ion is configurationally stable in solution up to room temperature as demonstrated by the stereospecific capture of the ion by various oxygen‐ and nitrogen‐based nucleophiles. Both isolated olefins and weak Lewis bases can promote the racemization of 5 but these
对映体富集的ira离子5是通过在-20°C的银辅助下硫化氯4的电离制备的。该硫鎓离子在溶液中直至室温下都具有构型稳定性,这可以通过各种基于氧和氮的亲核试剂对离子的立体定向捕获来证明。分离的烯烃和弱路易斯碱都可以促进5的消旋,但是在低温下也可以抑制这些过程。甲醇对5的捕获比消旋过程要快。