Four new chromogenic thiacrowns bearing 7 - aza - 1, 4, 10, 13 -tetrathiacyclohexadecane were successfully synthesized. The acid dissociation constants of chromogenic thiacrowns 3 and 4 were determined:pKa = 8.68(3);

• 本文报道了四个新的含7-氮杂-1；4；10；13-四硫杂环十六烷单元的生色冠硫醚的合成；测定了其中3；4的电离常数分别为:pK_a=8.；68(3);