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Isolation of the 9‐ and 10‐isomers of carboxystearic acid and their polyamidation with hexamethylenediamine
Author(s) -
Kohlhase W. L.,
Neff W. E.,
Pryde E. H.
Publication year - 1977
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/bf02909072
Subject(s) - hexamethylenediamine , polyamide , recrystallization (geology) , chemistry , stearic acid , salt (chemistry) , melting point , organic chemistry , chromatography , paleontology , biology
and summary Physical properties of the two isomers in 9(10)‐carboxystearic acid were found to be sufficiently different to permit isolation by recrystallization. Fractions containing carboxystearic acid of high isomeric purity but containing such impurities as stearic and hydroxystearic acids were purified through the nylon salts formed with hexamethylenediamine to obtain each isomer in high functional and isomeric purity. Physical properties were determined for each isomer, its nylon salt, and its polyamide. The different physical properties suggest for substituted dicarboxylic acids the alternating effect in melting points and solubilities shown by the unsubstituted α,ω‐alkanedioic acids.