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  Home > JCE Print > Journal of Chemical Education > Issues > 2004  > February  >
Chemical Education Today
Letters
Questioning an Ultrasonic Lab Setup
Francisco J. Arnáiz
Laboratorio de Química Inorgánica, Universidad de Burgos 09001 Burgos, Spain
Cover
February 2004
Vol. 81 No. 2
p. 193
Full Text
With regard to the article “Effective, Safe, and Inexpensive Microscale Ultrasonic Setup for Teaching and Research Labs” (1), it should be noted that the unique reaction presented in Figure 4 seems to be chosen to produce confusion to students. The opportunity to interpret the reaction on the basis of a Finkelstein reaction followed by an Ullmann-type process has been lost. But this interpretation might be questionable as it is the proposed intermediate. What is unquestionable is that the intermediate referred to as an oxyallyl cation is not a cation but a zwitterion, and, what is worst, the mentioned by-product, CuI2 (crucial to explain the need of excess copper referred to in the text, since in fact CuI is formed) is nonexistent.

Literature Cited

  1. Montaña, A. M.; Grima, P. M. J. Chem. Educ. 2000, 77, 754-757.
More Information
*  Citation
 Arnáiz, Francisco J. J. Chem. Educ. 2004 81 193.
*  Keywords
 Laboratory Equipment / Apparatus; Metals; Microscale; Organic Chemistry; Safety / Hazardous Substances
*  History
 Created:
Last Updated:		 January 5, 2004
February 25, 2005
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