Then, two novel betaine-type amphoteric surfactants,N-dehydroabietyl-N,N-dimethyl carboxymethyl betaine and its chloride, were synthesized from the intermediate N,N-dimethyl dehydroabietylamine.

• 从歧化松香胺中分离提纯去氢枞胺,然后以去氢枞胺为原料,经N,N-二甲基去氢枞胺中间体,合成了N-去氢枞基-N,N-二甲基羧甲基甜菜碱及其氯化物这两种新型甜菜碱类两性表面活性剂。