Organic Chemistry Dehydration Post Lab

Science

organic 1 lab

Boise State University

Question Description

Please help me complete this post lab and data analysis. The instructions file explains everything that I need to complete for this post lab and data analysis. Thank you so much I really appreciate the help!

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CHEM 308 Organic Chemistry 1 Lab Dehydration Reaction Data Analysis The GC data will have a series of peaks labeled with retention time (RT) and peak area (MA). Some peaks can be ignored, but you should pay attention to all peaks that have retention times and areas given. The approximate retention times for the expected compounds are given below, but note that the exact retention time can vary. Just like with other types of chromatography, the order that compounds elute does not change when the conditions are altered. Approximate retention times (in min.) … 3.05 3.15 3.39 3.71 5.02 Most likely identity α-terpinene limonene γ-terpinene terpinolene α-terpineol Once the GC data for our class is posted, complete the analysis described below and use the data complete your post-lab report form. Your Analysis: 1. Print the spectrum for the reaction mixture. a. On the spectrum, clearly draw the compound structure that corresponds to each peak. • There may be some slight variation in retention time (e.g., a peak expected at 2.24 min might show up at 2.20 or 2.27 min). b. If a peak from the table is NOT present in your spectrum, you should still draw the structure and indicate approximately where that peak would have been expected. 2. Complete your post-lab report form. Your ratios calculations should be similar to those from the Elimination lab. Example ratio calculations from the Elimination lab are below to assist in recalling the calculations. a. When writing ratios, the smallest component should be given the number “1”. All other numbers should be larger than 1 and reported with one decimal place. • For example: 2-Heptene trans : cis Ratio 4.6 : 1 (not 1 : 0.22) 1 : 8.7 (not 0.11 : 1) Name: _________________________________ Student ID # _________________ CHEM 308 REPORT FORM: Dehydration of Alpha Terpineol Submit via Canvas by 5 pm the day before your scheduled lab (must be PDF file) NOTE: If your results did not match your expectations, you can still receive full credit if you acknowledge and explain that your results were odd and then discuss what you think should have happened, and explain why you expected that. 1. 2 Calculate the theoretical yield for the products given the actual amount of material used. Show your work! 2 2 Calculate the percent yield for the products given the actual amount of material used. Show your work! 3. 2 Provide at least four relevant observations that occurred during this reaction. This should be based on what you could observe in the reaction video. (Note: Referring to an organic or aqueous solvent as a clear and colorless will not be counted as a relevant observation). Page 1 of 3 4. 6 Report your TLC analysis in a table below. As a budding scientist, the formatting of your data table is up to you, but you must include data for all spots from your starting material, crude product, and washed product (there are 9 spots total!). Recall that TLC data is typically reported as Rf values in a given solvent system, often with a descriptor (i.e. color, faint, etc.). The visualization techniques for each spot should also be reported. a) 5. 4 b) Based on TLC analysis alone, can you determine what diene isomers formed in this reaction? Explain your answer. (No more than 3 sentences) What analytical technique used in this lab allows you to determine the ratio of diene isomers formed? Report the ratio of diene isomers formed in your reaction as a simple ratio, setting the γ-terpinene as 1. Page 2 of 3 6. 4 Did the reaction go to completion? Cite at least three pieces of data from your IR and GC spectra and TLC analysis to support your conclusion. Turn in your analyzed GC spectrum and analyzed IR spectrum. Each is worth 5 points. (Follow the instructions posted on Canvas for each one) Page 3 of 3 Name: _________________________________ Student ID # _________________ CHEM 308 REPORT FORM: Dehydration of Alpha Terpineol Submit via Canvas by 5 pm the day before your scheduled lab (must be PDF file) NOTE: If your results did not match your expectations, you can still receive full credit if you acknowledge and explain that your results were odd and then discuss what you think should have happened, and explain why you expected that. 1. 2 Calculate the theoretical yield for the products given the actual amount of material used. Show your work! 2 2 Calculate the percent yield for the products given the actual amount of material used. Show your work! 3. 2 Provide at least four relevant observations that occurred during this reaction. This should be based on what you could observe in the reaction video. (Note: Referring to an organic or aqueous solvent as a clear and colorless will not be counted as a relevant observation). Page 1 of 3 4. 6 Report your TLC analysis in a table below. As a budding scientist, the formatting of your data table is up to you, but you must include data for all spots from your starting material, crude product, and washed product (there are 9 spots total!). Recall that TLC data is typically reported as Rf values in a given solvent system, often with a descriptor (i.e. color, faint, etc.). The visualization techniques for each spot should also be reported. a) 5. 4 b) Based on TLC analysis alone, can you determine what diene isomers formed in this reaction? Explain your answer. (No more than 3 sentences) What analytical technique used in this lab allows you to determine the ratio of diene isomers formed? Report the ratio of diene isomers formed in your reaction as a simple ratio, setting the γ-terpinene as 1. Page 2 of 3 6. 4 Did the reaction go to completion? Cite at least three pieces of data from your IR and GC spectra and TLC analysis to support your conclusion. Turn in your analyzed GC spectrum and analyzed IR spectrum. Each is worth 5 points. (Follow the instructions posted on Canvas for each one) Page 3 of 3 ...
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