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Analysis of cationic and amphoteric surfactants: IV. structural analysis of the amphoteric surfactants obtained by the reaction of 1‐(2‐Hydroxyethyl)‐2‐alkyl‐2‐imidazoline with ethyl acrylate
Author(s) -
Takano Satoshi,
Tsuji Kazuro
Publication year - 1983
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02680359
Subject(s) - chemistry , acrylate , alkyl , alkaline hydrolysis , cationic polymerization , hydrolysis , ethyl acrylate , solvent , polymer chemistry , diamine , organic chemistry , nitrogen atom , aqueous solution , polymer , copolymer
Abstract Structural analysis of amphoteric surfactants obtained by the reaction of l‐(2‐hydroxyethyl)‐2‐alkyl‐2‐imidazoline (HEAI) with ethyl acrylate or β‐propiolactone has been investigated. These amphoteric surfactants were hydrolyzed under aqueous alkaline media, followed by acid hydrolysis to afford fatty acids and diamine derivatives. By the analysis of the resulting fatty acids, it has been found that ethyl acrylate adds to the carbon atom alpha to an imidazoline ring in the absence of solvent. On the other hand, the resulting diamine derivatives were identified by the isolation and their syntheses, and were quantitatively analyzed by gas chromatography. Based upon the results of their analyses, it has been demonstrated that the reaction products can be divided into three types. In addition, on reaction of HEAI with β‐propiolactone, it was found that quaternization at the nitrogen atom of 3‐position occurred selectively.