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Scholars Day 2006, Wednesday, April 12

2,2-Dimethoxypropane as Potential Drying Agent for Green Solvents

The presence of water in organic solvents, specifically ionic liquids and surfactants, can interfere with water-incompatible reagents in chemical synthesis. Ionic liquids and surfactants are notoriously hygroscopic, and removal of water impurities can be difficult. In this investigation, 2,2-Dimethoxypropane (DMP) was used as a drying agent for these green solvents. The drying reaction was studied in several different types of ionic liquids and surfactants having a broad range of water content, 0.2-2 % H2O by mass. DMP reacts with water, in the presence of toluenesulfonic acid as catalyst, cleaving the ketal and forming acetone and methanol as products. The volatile products and remaining DMP reactant were then removed by stripping with nitrogen gas. Water content of most samples was reduced to a range of 0.04-0.06% water by mass, signifying that DMP is an effective drying agent.

Presenter: Michelle Sullivan (Undergraduate Student)
Topic: Chemistry
Location: 101 Edwards
Time: 9:30 am (Session I)