Can you answer these lab questions? all important information will given ( the lab manual ) in the chat.

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Can you answer these lab questions? all important information will given ( the lab manual ) in the chat.

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Can you answer these lab questions? all important information will given ( the lab manual ) in the chat.
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Can you answer these lab questions? all important information will given ( the lab manual ) in the chat.
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Can you answer these lab questions? all important information will given ( the lab manual ) in the chat.
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CHEM 242L Exp. 2 Pre-Lab / Diels Alder Name:_________________________________ Score:______/ 10 1. Using line-bond structures, draw a complete and concise reaction scheme. Include only the essential reagents. Under each structure write the molecular formula and molecular weight. 2. Complete the mechanisms (arrows showing electron flow) for the reactions in this experiment. (Hint: Interpret the underlined sentence from the end of the introduction and find the mechanisms for the functional group transformations in your text). H O O Diels–Alder reaction + O O Me arrows structure & arrows Nucleophilic attack of the alcohol on the neighboring carbonyl H + O H H A Collapse of the tetrahedral intermediate O O O O O Me O Me arrows O arrows Protonation of the carboxylate anion with generic acid (H–A) H + O O O Me A Deprotonation of oxonium to neutral lactone product H O arrows structure 3. Calculate the theoretical yield for the chemical reaction and show all calculations. 4. Briefly state the objective of the experiment and how the outcome of the experiment will be determined. What should you see in the data to prove the identity of the product and the consumption of starting material? For example, how many 13C and 1H NMR absorbencies and what molecular weight should be observed in the MS. What functional groups and frequencies would you expect for the IR?
CHEM 242L Exp. 1 Report / Substitution and Elimination Reactions Name:_________________________________ Score:______/ 20 Report Questions 1) For 1-bromopentane, draw the mechanism and products (with stereochemistry) if the reactants were to undergo each one of the following reaction mechanisms. Assume any chiral reactants are present as a racemic mixture. a. SN1 mechanism b. SN2 mechanism c. E1 mechanism d. E2 mechanism 2) For 2-bromopentane, draw the mechanism and products (with stereochemistry) if the reactants were to undergo each one of the following reaction mechanisms. Assume any chiral reactants are present as a racemic mixture. a. SN1 mechanism b. SN2 mechanism c. E1 mechanism d. E2 mechanism 3) Complete the two charts below for each reaction (one for 1-bromopentane and one for 2-bromopentane). Check the boxes according to which mechanism is favored based on the reaction conditions specified. Tally up the checks at the bottom of each chart and determine which of the four mechanisms would be expected to occur. Refer back to your textbook in Chapter 9 to review how each of the factors would influence the reaction pathway. 1-bromopentane Factor Description SN1 S N2 E1 E2 Description SN1 S N2 E1 E2 Substrate Strength of Nucleophile Strength of Base Concentration (of nucleophile or base) Leaving group Solvent Heat (only if tie between S/E) Total 2-bromopentane Factor Substrate Strength of Nucleophile Strength of Base Concentration (of nucleophile or base) Leaving group Solvent Heat (only if tie between S/E) Total 4) Report the major findings from the GC data for 1-bromopentane in a table. Report retention times and percent of each compound observed in the GC. Also normalize the percent values by include only reactants and products (excluding solvents and any unidentified compounds). Using the GC data determine the major product for each reaction and explain your reasoning. 1-Bromopentane Peak Time Compound GC Percent (area) Normalized Percent of Products Only 1 2 3 4 5 6 7 8 9 10 5) Report the major findings from the GC data for 2-bromopentane in a table. Report retention times and percent of each compound observed in the GC. Also normalize the percent values by include only reactants and products (excluding solvents and any unidentified compounds). Using the GC data determine the major product for each reaction and explain your reasoning. 2-Bromopentane Peak 1 2 3 4 5 6 7 8 9 10 Time Compound GC Percent (area) Normalized Percent of Products Only 6) Comment on whether the products observed for the reaction of 1-bromopentane matched what was expected. Were minor products formed? What were they and what pathway did they come from? Be sure to support your conclusions with the data you obtained. 7) Comment on whether the products observed for the reaction of 2-bromopentane matched what was expected. Were minor products formed? What were they and what pathway did they come from? Be sure to support your conclusions with the data you obtained.

Tutor Answer

drpnanibabu
School: Duke University

Hi! I have uploaded the answer for the DIels -Alder reaction. Kindly check and let me know if you need any more

CHEM 242L
Exp. 2 Pre-Lab / Diels Alder

Name:_________________________________
Score:______/ 10

1. Using line-bond structures, draw a complete and concise reaction scheme. Include only the essential
reagents. Under each structure write the molecular formula and molecular weight.

2. Complete the mechanisms (arrows showing electron flow) for the reactions in this experiment. (Hint:
Interpret the underlined sentence from the end of the introduction and find the mechanisms for the
functional group transformations in your text).

H

O
O
Diels–Alder
reaction

+

O
O

Me
arrows

structure & arrows
Nucleophilic attack
of the alcohol on th...

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Anonymous
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