Application of trichloroethylene in organic syntheses, IV. Syntheses of 9‐(1,2‐dichlorovinyl)carbazoles

Abstract
Trichloroethylene reacts stereoselectively with carbazole or its derivatives in the presence of aqueous NaOH and catalytic amounts of benzyltriethylammonium chloride (TEBA) to give high yields (about 80%) of 9‐[(E)‐1,2‐dichlorovinyl] carbazole derivatives 6.