TCE

The Chemical Educator

ISSN: 1430-4171 (electronic version)

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Abstract Volume 24 (2019) pp 147-151

Copper Complexes of Salicylaldehyde-Amine Adducts: A Simple and Reliable Colorimetric Alternative to the Classic Hinsberg Test for the Qualitative Analysis of Primary, Secondary, and Tertiary Amines

Timothy L. Friebe* and Donald M. Snyder

Department of Chemistry, Eastern Michigan University, Ypsilanti, Michigan 48197, tfriebe@emich.edu
Received February 22, 2019. Accepted November 11, 2019

Published: 17 December 2019

Abstract. Qualitative analysis and identification of an unknown compound is a common organic laboratory experiment in which various chemical and physical tests are completed in an effort to identify the functional group present. Most of these tests are simple and relatively unambiguous, often using changes in color to indicate a positive test. One notable exception is the Hinsberg test for amine classification. Despite being the standard for over 100 years, this diagnostic test is difficult to interpret for those with experience while less experienced organic students have difficulty correctly interpreting the results. To address this problem, the Friebe-Snyder test for amine classification was specifically designed as an inexpensive, quick, easy, and accurate colorimetric test suitable for laboratory students of all skill levels.

Key Words: Laboratories and Demonstrations; organic chemistry; qualitative analysis; problem solving/decision making

(*) Corresponding author. (E-mail: tfriebe@emich.edu)

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Supporting Materials:

A handout (including color pictures) for student use can be found in the Supplementary Materials. (7710 KB)

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