5-mercapto-2-nitro paraphenylenediamine compounds and hair dye compositions containing same
申请人:Bristol-Myers Squibb Company
公开号:EP0688767A1
公开(公告)日:1995-12-27
Direct dyes are disclosed, which have the structure:
wherein R, R₁, R₂ and R₃ are the same or different and are hydrogen, C₁ to C₄ alkyl or C₁ to C₄ hydroxyalkyl having from 1 to 2 hydroxy groups, with the proviso that R is not hydrogen.
Unlike their ortho counterparts, meta- and para-acetamidoanilines can be converted into the corresponding acetamidoarenediazoniumsalts. These offer various opportunities for multiple Pd-catalyzed arene functionalization reactions, such as Matsuda-Heck-, Suzuki-Miyaura- or Fujiwara-Moritani couplings.