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Pentaethylene glycol di-p-toluenesulfonate is used in the preparation of calixarenes, calixarenes, and crown ethers. It is also used in the preparation of 3?-formylbenzo-18-crown-6 by undergoing coupling reaction with 2,3-dihydroxybenzaldehyde.
Hong-Seok Kim.; Ii-Chun Kwon.; Jun-Hyeak Choi. Synthesis of crown ethers containing a thiazole subcyclic unit. Journal of Heterocyclic Chemistry. 1999 36 (5), 1285-1289.
Chuqiao Tu.; Dazhan Liu.; Kazimierz Surowiec.; David W. Purkiss.; Richard A. Bartsch. Di-ionizable p-tert-butylcalixarene-1,2-crown-5 and -crown-6 compounds in the cone conformation: synthesis and alkaline earth metal cation extraction. Org. Biomol. Chem. 2006, 4 (11), 2938-2944.
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