Ethanol and benzene are highly flammable materials; therefore approved electric or steam heating has been specified.
This entire procedure must be performed in a chemical fume hood. Caution should be taken to avoid open flame. Benzene
is a particularly toxic substance. Care should be taken to avoid inhalation, ingestion, or body contact. Dichloromethane
causes narcosis when inhaled and can be irritating to the eyes. Be sure to refer to the chemical caution statement on page
1.