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1-Butyl-3-methylimidazolium trifluoromethanesulphonate is an aprotic neutral ionic liquid.
BI-0320 (OTTO) 1-Butyl-3-methylimidazolium trifluoromethanesulphonate, ≥95% (H-NMR) Cas 174899-66-2 - used as an alternative to lithium perchlorate-diethyl ether mixture in the Diels-Alder reaction.