Notes on Running Reactions: Page 2

Stirring, Syringes and Needles, Temperature Control

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If stirring stops during a reaction, all bets are off. It is very important to stir continuously throughout an experiment.

If you experience problems stirring, here are some things to try:   (replaces the troubleshooting the reaction link)

Remember, if your reaction is heterogeneous, it must be stirred very vigorously to ensure efficient mixing.

Stir Bars

Overhead Stirring

When a stirbar simply does not do the job, mechanical stirring is necessary. An overhead stirring apparatus is typically employed.

Situations when overhead stirring may be required: high viscosity solutions, large scale reactions, or in heterogeneous reactions when a stirbar becomes mired in gunky, gooey, or otherwise insoluble material.

Syringes and Needles

Temperature Control

Synthetic organic experiments are conducted at temperatures ranging from -90 degrees to 200 degrees Celcius. It is important to know how to achieve and maintain the correct temperature for a reaction, especially over long time periods. Temperature should be monitored with a low-temperature alcohol thermometer.

Low Temperature Cooling Baths

See also: The Complete List on the Hoveyda Group website.

High Temperature Reactions

See also: Complete list of heat sources for chemical reactions

See also: How to work in an Inert Atmosphere, How to use a syringe