Flask sidearm

When the crystals are dry, and you have a water trap, just turn off the water aspirator. Water won t back up into your flask. [If you ve been foolhardy and filtered without a water trap, just remove the rubber tube connected to the filter flask sidearm (Fig. 47)]. 

Dream setup 100 ml of DMF stirring in a flask equipped w/ a sidearm 34 g of safrole was added in 4 portions of about 8 g each. Mixed intimately. Next, 11g of p-benzoquinone was added. Stir rate was upped. Finally, 7 g of pdcl2 was added. A dry addition... 

Tomato cell suspensions in modified Murashige and Skoog medium (12) were assayed for change in cell volume at varying concentrations of polar and nonpolar extracts. Twenty-five ml erlenmeyer flasks (5 reps/treatment) containing 10 ml of sterile medium, tomato cell suspension, and extract were allowed to settle for 20 min in sidearm test tube attachments. Relative height of cell volume fraction to medium was recorded each day for 11 days. Cell suspensions were incubated in the dark at 27 C on an orbital shaker at 125 rpm. The doubling time of control cell suspensions were approximately 2.25 days. 

Clamp a filter flask to a ringstand. This filter flask, often called a suction flask, is a very heavy-walled flask with a sidearm on the neck. A piece of heavy-walled tubing connects this flask to the water trap (see Fig. 48). 

Figure 85c shows a pressure-equalizing addition funnel. See that sidearm Remember when you were warned to remove the stopper of a separatory funnel so you wouldn t build up a vacuum inside the funnel as you emptied it Anyway, the sidearm equalizes the pressure on both sides of the liquid you re adding to the flask, so it ll flow freely, without vacuum buildup and without you having to remove the stopper. This equipment is very nice, very expensive, very limited, and very rare. And if you try an extraction in one of these, all the liquid will run out the tube onto the floor as you shake the funnel. 

B. Fluoromethyl phenyl sulfone (2). To a 3-L, three-necked, round-bottomed flask, equipped with an overhead stirrer, thermometer, and 1-L addition funnel with sidearm are added Oxone (221.0 g, 0.36 mol) (Note 9) and water (700 mL). The mixture is cooled to 5°C and a solution of the crude fluoromethyl phenyl sulfide (1) in methanol (700 mL) is placed in the addition funnel and added in a slow stream to the stirring slurry. After addition of the sulfide, the reaction mixture is stirred at room temperature for 4 hr, (Note 10) and the methanol is removed on a rotary evaporator at 40°C. The remaining solution is extracted with methylene chloride (2 x 500 mL). The combined organic layers are dried over magnesium sulfate, concentrated to ca. 150 mL, filtered through a plug of silica gel (230-400 mesh, 300 mL, 10 x 6.5 cm), and washed with an additional 500 mL of methylene chloride (Note 11). The colorless filtrate is concentrated and the resulting oil or solid is dried under vacuum (0.1 mm) at room temperature to provide 29 g of crude fluoromethyl phenyl sulfone (2) as a solid... 

In a drybox, a 250-mL sidearm flask containing a 1-in. magnetic stirring bar is loaded with a mixmre of 1.00 g (1.81 mmol) of (Salen Bu)AlCl and 0.351 g (1.81 mmol) of sodium para-toluenesulfonate (NaOTs). As solids, they do not react. The stopcock of the sidearm flask is closed, a rubber septum placed on the neck, and the flask brought out of the drybox and placed onto a vacuum... 

Methylnaphthalene (40.5 mL, 285 mmol) is transferred via cannula to a stirred suspension of lithium wire, 3.2 mm diameter, cut into 2-mm lengths (1.34 g, 193 mmol) in 200 mL of anhydrous THF in a 1-L round-bottomed flask, equipped with a sidearm stopcock for attachment to the vacuum line and a... 

The checkers added the sodium sulfinate from a 100-ml, three-necked flask via a bent sidearm fitted to the reaction vessel. A stream of nitrogen flowing through the 100-mL flask prevented backflow of fumes from the reaction and caking of the sodium sulfinate powder. 

The trimethylindium-diethyl ether solution prepared above is now added to the distillation flask using a cannula inserted through the sidearm Suba-Seal. Finally, with a rapid purge of argon applied through the paraffin-oil bubbler, the Suba-Seal is replaced quickly by a stopper and the argon flow is readjusted to its former flow rate. 

Flasks 2 and 3, and all the interconnecting glass tubing, are fully evacuated through one of the sidearm gas valves and the whole system is sealed under vacuum. 

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