I need help doing a lab for organic chemistry that requires gas chromatography analysis. My assigned alcohol was potassium t-butoxide. Please follow the instuctions attached and do the GC analysis on the potassium t-butoxide graphs.
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elimination_reaction_data_interpretation_.docx
elimination_reaction_gc_spectra.pdf
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Elimination Reaction Data Interpretation
Pay particular attention to the note at the end with respect to the submission deadline for the
spreadsheet and the late penalties.
There are two spectra included for each alcohol used (and the potassium t-butoxide). One is a full
spectrum and one is an expanded spectrum. You need to print and analyze only the set of two spectra
from your assigned alcohol (or potassium t-butoxide).
1. Use the table below (from a library search of the peaks found in the GC/MS spectra) to identify
the peaks in the spectra from your assigned alcohol. (The peak retention times may vary slightly.)
Clearly mark each peak’s identity on the full spectrum for your assigned alcohol. My assigned
alcohol was potassium t-butoxide
2. Note that there are two peaks listed as 2-heptene; you must decide which are most likely to be the
cis- and the trans- isomers.
3. Measure (to the nearest 0.1 mm) the height and width at half-height of the three expected peaks
on the expanded spectrum for your assigned alcohol. (One of the four alkenes present is an
unexpected product; refer to the experiment reaction to decide which alkene does not belong.)
Note: if the peaks are not a sharp point at the top, extrapolate out the sides of the peak until
they meet before measuring the peak height. Record all measurements directly on the spectrum.
4. Calculate the area of each peak in mm2.
5. Calculate a ratio of the areas of the three peaks as directed in the “Analysis of GC Data”
information following the experiment procedure in the lab manual.
6. Calculate each peak as a percent of the total area of the three.
7. Calculate simple ratio of three peaks.
8. Record the specified data in the spreadsheet cells.
9. The amount of SN2 Products and/or Starting Material present will be determined as follows: Enter
“Lots” if the SN2 Product/Starting Material peak’s height is from 50-100% of the height of the
tallest elimination product peak’s height. If the SN2 Product/Starting Material peak’s height is
from 0-50% of the height of the tallest elimination product peak’s height, enter “Some”. If there is
no peak visible where one would be expected for these materials (based on the retention times
provided below), enter “None” in the spreadsheet.
Peaks with retention times (in min.)
of approximately:
2.24
2.31
2.38
2.46
4.63-4.64
5.45
6.24-6.29
Are most likely
from this compound:
1-heptene
3-heptene
2-heptene
2-heptene
2-methoxyheptane
2-ethoxyheptane
2-bromoheptane
Complete the specified measurements and calculations (items 3-6 above) and enter them in the
provided google doc spreadsheet. When all of the data from the section are compiled proceed to your
final analysis and lab report questions.
Be sure to turn in your annotated spectra (with peaks identified and measurements indicated) to
your instructor.
Submission Deadlines and Late Penalties:
Because everyone in each section must have ALL of the class data to complete their conclusion for this
experiment, timely submission of your calculations is critical. The deadline for the submission of
your GC calculations though google spreadsheet is set by your instructor.
Late penalties will be assessed as follows:
Five points will be deducted if the calculation submission through google document spreadsheet is
late that is any time after the deadline set by your lab instructor.
Your report will be due at the beginning of your next lab.
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