A New Gas Trap WC12
A new gas trap has been devised taking advantage of the available apparatus of a standard organic laboratory (specifically the Kimbel, Labset, or similar type ground glass equipment). This gas trap is more efficient than the standard gas trap [KAYIC, I. A., SATLER,L., AND TWI:ED, R., J. CHBM.EDUC.,31, 266 (1954); VOGICL, A. I., "Practical Organic Chemistry" (3rd ed.) John Wiley and Sons, Inc., New York, 1957, p. 711, and since it uses normally available equipment, it is less costly for larger J. W., AND INDICTOR, laboratories than the recently described T-tube modification [HORODNIAK, N., J. CHEM.EDUC.,46,568 (1970)). The apparatus is wsembled by placing the vacuum adapter in the top of a reflux condenser, and attaching the vacuum outlet to a water aspirator. The female joint end is left open to the air or if the reaction has to he run under anhydrous conditions can he used as a drying tube. This gas trap has been tested in the undergraduate organic laboratories at the University of Texas by the authors with complete satisfaction. Both the free radical chlorination of n-heptane (using SOaCln initiator) and the preparation of benzoyl chloride (using henzoie acid SOxC1.) L. B., AND WINGROVE, A. S., [experiments found in ROBERTS, R. M., GILBERT,J . C., RODEWALD, "Modern Experimental Organic Chemistry," Holt, Rinehart, and Winston, Ine., New York, 19681, were performed in eighteen student laboratory sections without the use of hoods and there was little or no detectable odor of SO1 or HC1. The main advantages of this gas trap are its high efficiency, ease of construction, and ready availability to the student. TO=
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OF TEXAS AT AUSTIN THE UNIVERSITY AUSTIN,TEXAS78712
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R. S. SAPIENZA, W. G. PADOLINA D. L. MCELWEE,G. C. DEAN
Volume 48, Number 8, August 1971
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