Vibromischer stirrer

To the flask are added 13.4 g. (0.58 mole) of clean sodium and 200 ml. of absolute toluene. The Vibromischer stirrer is activated, the toluene heated to reflux, and the agitation continued at this temperature until all the sodium is pulverized into a very fine sand. The agitation is ceased, and the solution is allowed to cool to room temperature. The nitrogen flow rate is increased, the Vibromischer stirrer is replaced with a conventional sealed mechanical stirrer with a Teflon blade, and a solution of 85 g. (0.6 mole) of 2-carbomethoxycyclopentanone (Note 2) in 450 ml. of absolute benzene is placed in the addition funnel. 

A. 2-Benzyl-2-carbomethoxycyclopentanone. A dry 2-1. threenecked flask is fitted with a Vibromischer stirrer (Note 1), a reflux condenser, and a 250-ml. dropping funnel with a pressureequalizing side tube. A nitrogen-inlet tube is connected to the top of the dropping funnel, and an outlet tube is placed on the... 

A device which has much the same effect as a high-speed stirrer is a vibrating stirrer known as a Vibromischer (Fig. 5-15). The stirring shaft is attached to the flask by means of a flexible rubber sheet and vibrates up and down at 60 cps. The shaft may be fitted with various... 

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