DEDICATED TO PROFESSOR HC BROWN ON HIS ... - Sigma-Aldrich
DEDICATED TO PROFESSOR HC BROWN ON HIS ... - Sigma-Aldrich
DEDICATED TO PROFESSOR HC BROWN ON HIS ... - Sigma-Aldrich
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Glassware for Air-Sensitive Chemistry<br />
Glassware for Air-Sensitive Chemistry<br />
TYPICAL OPERATI<strong>ON</strong>S USING ALDRICH SCHLENK-TYPE GLASSWARE<br />
Chemical Reaction<br />
After securing the reaction flask and initiating<br />
stirring, the apparatus is slowly rotated<br />
about the joint between the two adapters,<br />
allowing the reagent solution to flow into<br />
the reaction flask.<br />
Filtration/Recrystallization<br />
The H-Schlenk tube permits low-temperature filtration if a<br />
large cooling bath is used. The illustration shows a set-up<br />
for recrystallization. Starting material is transferred from<br />
the reaction and storage tube on the far left, into the H-<br />
Schlenk tube where it is dissolved with solvent from the<br />
dropping funnel, filtered into the right leg, and recrystallized.<br />
Purified material is transferred to the sealing tube<br />
on the far right.<br />
ALDRICH SCHLENK-TYPE GLASSWARE<br />
This system is specifically designed for additions, chemical reactions, distillations, drying/evaporation,<br />
extractions, filtrations, recrystallizations, washing, degassing, and transfers of solids and liquids. For smallscale<br />
manipulation of air- and moisture-sensitive reagents. <strong>Aldrich</strong> Schlenk-type glassware is available with<br />
greaseless threaded B14/20 ground-glass joints and is compatible with the <strong>Aldrich</strong> All-in-One Glassware<br />
Kit.<br />
• Greaseless threaded B joints require no clamps<br />
• Narrow openings minimize infusion of air during manipulations<br />
• Side-arm stopcocks for evacuation of air and purging with inert gas<br />
• May be used with ordinary glassware with B joints<br />
Fig. 1: Threaded joint consists of an externally threaded female B joint and a corresponding male B joint with<br />
a threaded plastic nut and O-ring that seals above the ground-glass joint to make a vacuum-tight, greaseless seal.<br />
A simple twist of the nut loosens the joint for safe disassembly.<br />
Fig. 1<br />
Distillation<br />
Distillation under inert atmosphere and/or<br />
reduced pressure is easily accomplished<br />
using this apparatus.<br />
Filtration/ Washing<br />
A precipitate may be collected<br />
and washed using this apparatus.
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