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ERIC Number: EJ1036350
Record Type: Journal
Publication Date: 2014-Aug
Pages: 3
Abstractor: As Provided
Reference Count: 13
ISSN: ISSN-0021-9584
Analysis of Bromination of Ethylbenzene Using a 45 MHz NMR Spectrometer: An Undergraduate Organic Chemistry Laboratory Experiment
Isaac-Lam, Meden F.
Journal of Chemical Education, v91 n8 p1264-1266 Aug 2014
A 45 MHz benchtop NMR spectrometer is used to identify the structures and determine the amount of 1-bromoethylbenzene and 1,1-dibromoethylbenzene produced from free-radical bromination of ethylbenzene. The experiment is designed for nonchemistry majors, specifically B.S. Biology students, in a predominantly undergraduate institution with insufficient resources for the initial cost and maintenance of high-field Fourier transform (FT) NMR instrumentation. Students learn the basic concepts of nuclear magnetic resonance, acquire FID (free-induction decay) signals, process the data, interpret, assign peaks, and determine product composition. The experiment demonstrates to students that NMR spectroscopy can be used for molecular structure characterization and for determination of product yields. Hands-on experience with a low-field spectrometer provides undergraduate students with confidence to run an NMR instrument while minimizing fear that can be generated at the sight of high field FT-NMR instrumentation.
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:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: Higher Education; Postsecondary Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A