Chem 654_Lab 2 Reaction of Dimethylbutanediol Report

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School

University of New Hampshire *

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Course

654

Subject

Chemistry

Date

Feb 20, 2024

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pdf

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3

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Chem 654: Lab 2 Reaction of 2,3-Dimethyl-2,3-butanediol with an Acid Catalyst Laboratory Report Laboratory Notebook Setup Add the following information to your laboratory notebook prior to coming to lab: Descriptive Title of the Experiment (1 point) Objectives (1 point) Techniques (1 point) Structures Write out the reaction used in the experiment. Draw structures for the organic starting material. Because the structure of the product is at this point unknown, a molecular formula should be used. (3 points) Table of Reagents Substance MW Wt. or Vol. Moles MP, o C BP Density g/mL Hazards 2,3-Dimethyl-2,3- butanediol 3 M Sulfuric Acid Sat. Aq. NaCl Product (C 6 H 12 O) Theo yield = ? Theo moles = ? 2,4-DNPH Soln Chromic Acid Aq. KMnO 4 (3 points) Laboratory Notebook Follow the requirements in the notebook guidelines. Notebook pages should contain enough information so that you or a peer could easily repeat the experiment. Remember to record observations.
Chem 654 Report Form Lab #2 – Reaction of 2,3-Dimethyl-2,3-butanediol Name Date TA Product Information (4 points) Structure of product: (3 points) Weight of crude product: Weight of purified product: Percent yield of purified product: (show calculations) (7 points) Reaction Mechanism Draw the reaction mechanism for the reaction of 2,3-dimethyl-2,3-butanediol with sulfuric acid that accounts for the product isolated, as described above. (3 points) Laboratory Technique Points for good lab technique. You are not required to complete anything here; the TA will give your score on the rubric.
Post Lab Questions (4 points) 1. Label relevant peaks on the IR spectrum obtained during this experiment as well as the starting material. Upload the labeled spectra at the end of your report. (9 points) 2. Discuss how the IR data, the classification tests, and mechanism fit the proposed structure. Your discussion should reveal how you logically arrived at your final structure assignment, discuss the results of the classification tests, the mechanism, and compare the IR of the product obtained with the IR of the starting material (to be posted under module). Be sure to list specific peaks and give their assignment. Are there any stretches not present that helped with your assignment?
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