Figure 1. Sulfonic acid group functionalized Brönsted acidic ionic liquid catalysts (1-8)

From

Sulfonic Acid Group Functionalized Ionic Liquid Catalyzed Hydrolysis of Cellulose in Water: Structure Activity Relationships

Ananda S. Amarasekara, Bernard Wiredu

Sustainable Energy. 2014, 2(3), 102-107 doi:10.12691/rse-2-3-4