The first radical alkoxycarboxylation of aryldiazoniumsalts using CO gas through visible‐light‐induced photoredoxcatalysis (16 W blue LEDs) has been developed. This reaction is entirely metal‐free, is carried out at room temperature with a low loading of an organic dye as a photocatalyst (0.5 mol %), and provides a wide range of arylcarboxylic acid esters in high yields. Importantly, this photocatalytic
Process for the production of arylsulfonyl halides
申请人:STAUFFER CHEMICAL COMPANY
公开号:EP0243584A1
公开(公告)日:1987-11-04
There is disclosed a process for the production of arylsulfonyl halides, e.g., benzenesulfonyl chloride. The disclosed process adds a phosphorus-containing additive, e.g., phosphorous acid, before the reaction of an arylsulfonic acid with a sulfur halide and a halogen. The phosphorus-containing additive reduces the thermal instability of the residue remaining after distillation of the arylsulfonyl halide.