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ERIC Number: EJ1046320
Record Type: Journal
Publication Date: 2014-Nov
Pages: 5
Abstractor: As Provided
Reference Count: 42
ISBN: N/A
ISSN: ISSN-0021-9584
Mass Spectrometry in Organic Synthesis: Claisen-Schmidt Base-Catalyzed Condensation and Hammett Correlation of Substituent Effects
Bain, Ryan M.; Pulliam, Christopher J.; Yan, Xin; Moore, Kassandra F.; Mu¨ller, Thomas; Cooks, R. Graham
Journal of Chemical Education, v91 n11 p1985-1989 Nov 2014
Undergraduate laboratories generally teach an understanding of chemical reactivity using bulk or semimicroscale experiments with product isolation and subsequent chemical and spectroscopic analysis. In this study students were exposed to mass spectrometry as a means of chemical synthesis as well as analysis. The ionization method used, paper spray, is rapid and can be coupled with online analysis (by mass spectrometry) or off-line analysis (e.g., thin layer chromatography). Chemical synthesis in the course of paper spray ionization takes advantage of the accelerated reaction rates associated with changes in pH and reagent concentrations. Such changes arise from solvent evaporation from charged microdroplets. In these experiments students contrasted paper spray techniques with traditional bulk synthetic methods for the Claisen-Schmidt base-catalyzed condensation. From mass spectral data obtained during the laboratory session, students were able to model electronic effects of substituents on reaction rates. Experimental procedures tailored to the undergraduate organic teaching laboratory are provided.
Division of Chemical Education, Inc and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail: eic@jce.acs.org; Web site: http://pubs.acs.org/jchemeduc
Publication Type: Journal Articles; Reports - Evaluative
Education Level: Higher Education; Postsecondary Education
Audience: N/A
Language: English
Sponsor: National Science Foundation
Authoring Institution: N/A
IES Grant or Contract Numbers: CHE-1307264