How Do You Interpret Spectral Data for This Compound?

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Discussion Overview

The discussion revolves around the interpretation of spectral data for a compound, focusing on infrared (IR) and nuclear magnetic resonance (NMR) spectra. Participants are attempting to deduce the structure of the compound based on the provided spectral information.

Discussion Character

  • Homework-related
  • Exploratory
  • Technical explanation

Main Points Raised

  • One participant notes a sharp IR absorption between 1700 and 1720 cm-1, suggesting it corresponds to a carbonyl (C=O) of an acid, and a broad absorption between 2500-3000 cm-1, indicating an O-H group.
  • Another participant highlights the significance of the singlet at 12.40 in the 1H NMR spectrum and the carbon signal at 173.89 in the 13C NMR, questioning what types of groups absorb around 7 ppm in 1H NMR.
  • There is a mention of the integration of the 1H NMR providing information about the total number of protons and the ratio of different types of carbon signals to hydrogen signals.
  • A participant expresses confusion about how to begin interpreting the information provided, indicating a lack of understanding of the spectral data.
  • Another participant suggests that the answer cannot be found in a book or online, implying that critical thinking is necessary to interpret the data.

Areas of Agreement / Disagreement

Participants express varying levels of understanding regarding the interpretation of the spectral data. While some propose interpretations based on the spectral features, others indicate confusion and a lack of clarity on how to proceed, suggesting that no consensus exists on the interpretation.

Contextual Notes

Participants have not reached a resolution regarding the interpretation of the spectral data, and there are indications of missing assumptions or steps in reasoning that could clarify the discussion.

sciontc03
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Homework Statement



I'm having a hard time understanding spectral data.
It says that there is a compund with a sharp IR between 1700 and 1720 cm-1 and a strong broad absorption over the region 2500-3000 cm-1. 1H NMR: 2.49 (t, 2H), 2.80 (t, 2H), 3.72 (s, 3H), 6.78 (d, 2H), 7.11 (d, 2H), 12.40 (s, 1H). 13C NMR: 173.89, 157.57, 132.62, 128.99, 113.55, 54.84, 35.75, 29.20.

How do you interpret this or is there a place that you can go to on the web to find out what structure you have that I missed?

Homework Equations





The Attempt at a Solution



sharp IR between 1700 and 1720 cm-1 (this is a carbonyl C=O of an acid) and a strong broad absorption over the region 2500-3000 cm-1 (this is an O-H group).
 
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Yes, and there's that singlet in the 1H NMR spectrum at 12.40 and the 173.89 in the C13. What type of groups absorb at around 7 ppm in 1H? The integration of the 1H gives you how many total protons? How many different types of carbon signals do you have? Look at the ratio of those two (C/H). Notice anything?
 
No. I really don't know how to even begin to understand this information. That's all of the information I was given.
 
You are not going to find the answer in a book or online. The answer requires you to use some gray matter...

Are you saying that you don't understand this?
1H NMR: 2.49 (t, 2H), 2.80 (t, 2H), 3.72 (s, 3H), 6.78 (d, 2H), 7.11 (d, 2H), 12.40 (s, 1H). 13C NMR: 173.89, 157.57, 132.62, 128.99, 113.55, 54.84, 35.75, 29.20.