poly(ethylene glycol)-bound sulphonic acid in chloroform T=50 - 60°C;
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South African Journal of Chemistry, 2013 , vol. 66, p. 254 - 262
Huebner; Schneider
Justus Liebigs Annalen der Chemie, 1871 , vol. 167, p. 101,524
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Salkowski
Justus Liebigs Annalen der Chemie, 1874 , vol. 174, p. 265