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ERIC Number: EJ913062
Record Type: Journal
Publication Date: 2010-Jan
Pages: 3
Abstractor: As Provided
Reference Count: 5
ISBN: N/A
ISSN: ISSN-0021-9584
Synthesis of 2,5-Dichloro-2,5-Dimethylhexane by an S[subscript N]1 Reaction
Wagner, Carl E.; Marshall, Pamela A.
Journal of Chemical Education, v87 n1 p81-83 Jan 2010
This laboratory experiment was developed to provide a safe, economical, and effective way to instruct undergraduate organic chemistry students about the unimolecular nucleophilic substitution (S[subscript N]1) reaction. Students treat 2,5-dimethyl-2,5-hexanediol with excess concentrated hydrochloric acid to synthesize 2,5-dichloro-2,5-dimethylhexane, assess solubility of the starting material and the product in different solvents, and determine purity with thin-layer chromatographic analysis. The experiment was performed by approximately 97 students. The effectiveness of the laboratory was assessed by two separate methods: a qualitative postlab student self-assessment and a quantitative prelab and postlab three-point quiz. For the qualitative student self-assessment, the students stated that they acquired an improved understanding of the S[subscript N]1 reaction from the experiment. The average on the quantitative prelab and postlab quiz increased from 0.80 [plus or minus] 0.86 to 1.69 [plus or minus] 1.02 and demonstrated a statistically significant improvement. The percentage of students who were able to correctly identify the S[subscript N]1 reaction mechanism increased from 22.9% to 46.5% from the prelab quiz to the postlab quiz and further to 74.2% on the midterm exam. (Contains 2 tables, 3 figures and 1 note.)
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
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A