For many reactions in this course, the reaction vessel will be a Schlenk flask. It consists of a pear-shaped or a round-bottomed flask, which has a sidearm near the top to connect it to the vacuum/inert gas line. If you conduct experiments under inert gas, the glassware has to be appropriately prepared by flame-drying the equipment under vacuum. Here are some additional pointers to consider when you use Schlenk flasks:


1. The stopcock plugs has to fit tight into stopcock. Be aware of the fact that there are different type of stopcock plugs. Make sure that the holes of the inner and outer part match up and that the passage is free. Secure the stopcock plug with a spring and/or retainer clip or a nut (if the stopcock has a thread). Don't forget to lubricate the plug lightly to get a better seal (only for glass plugs not for Teflon plugs).

2. All joints should be cleaned and lightly lubricated to have a better seal. Make sure that there are no solids at the joints. The joint can easily be broken.

3. Clamp the flask at the joint, especially if it has to hold a bigger setup. Make sure that the clamp still has its 'rubber tips' to ensure that the glass does not get in direct contact with the metal, which usually leads to breakage as well.The clamp should have the appropriate size (not too small and not too big!). Keep in mind that it will have to support the entire weight of your setup.

4. If you stir a solution in the flask, make sure that the stirring bar is in good condition (teflon coating intact).

5. The picture below shows a Schlenk tube that can be used to carry out reactions or store air-sensitive materials.