Figure 1From: Evaluation of four ionic liquids for pretreatment of lignocellulosic biomassNMR analysis of ionic liqid preparations: (A) 1-butyl-3-methylimidazolium acetate, (B) 1-butyl-3-methylimidazolium hydrogen sulfate, (C) 1-butyl-3-methylimidazolium chloride, and (D) 1-allyl-3-methylimidazolium acetate. Data of 13C NMR (left side) and 1H NMR (right side) analysis are shown.Back to article page