Sulfonic para base ester is mainly used in the synthesis of KN, M and other reactive dyes. Due to the introduction of a sulfonic acid group in the amino ortho-position of the original para-ester molecule, the sulfate-group activity of the sulfonated para-ester molecule is improved, the activity of the reactive dye synthesized from the product is improved correspondingly, and the color fixation rate and lifting rate of the dye are significantly improved, which can be used in the synthesis of advanced reactive dyes such as liquid dyes.
