A novel process for the amidation or esterification which comprises reacting a compound having a carboxy group with a compound having an amino or imino group which can be acylated or with a compound having a hydroxy group in the presence of a sulfonic acid ester of the formula: R.sub.1 --SO.sub.2 --OR.sub.2 wherein R.sub.1 is an organic group and R.sub.2 O-- is a residue of a strongly acidic N-hydroxy compound as a condensation agent, and a novel sulfonic acid ester useful as such a condensation agent and a process for the preparation thereof.
一种新的
酰胺化或
酯化过程,包括在有机
磺酸酯的存在下,将具有羧基的化合物与可以酰化的
氨基或亚
氨基化合物,或具有羟基的化合物反应,其中有机
磺酸酯的
化学式为:R.sub.1 --SO.sub.2 --OR.sub.2,其中R.sub.1为有机基团,R.sub.2 O-是强酸性N-羟基化合物的残基,作为
缩合剂,还提供了一种新的有用的
磺酸酯缩合剂及其制备方法。