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So, you need to drive a chemical reaction by heating it at reflux. You will need to heat the reaction at the boiling point of your solvent(s) and fit a reflux condenser to the RBF. The condenser has cold water flowing through it; the solvent which has evaporated from the reaction will condense on the surface of the condenser and drip back down into the reaction, thus preventing your reaction from drying out.
This material is based upon work supported by the National Science Foundation under Grant Number 1246120