Can you answer these lab questions? all important information will given ( the lab manual ) in the chat.Thank you
file4.jpeg

file6.jpeg

file7__1_.jpeg

chem_242l_prelab_2.docx

chem_242l_report_form_1.docx

Unformatted Attachment Preview

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.

Purchase answer to see full
attachment