Carbon and DEPT Spectra

Look at these spectra and make a table of the results. By combining the information from these four experiments it is possible to identify C, CH, CH2, and CH3 carbons. You may use the jdx files for viewing in your web browser, or you may download the NUTS Fid's for processing. NOTE: Since the carbon spectra files are large, it will take a moment for them to load in your browser.
  1. C-13 NMR Data (jdx, NUTS)
    1. Experimental Description - 75 MHz Carbon NMR. Proton decoupled.
    2. Spectral Interpretation
      1. Chemical Shift (ppm), indicates chemical environment.
      2. These are decoupled spectra so no splitting information is present.
      3. Notice solvent peak (CDCl3) at ca 77 ppm.
      4. Quaternary carbon's frequently give small peaks.
      5. Acquisition conditions NOT optimized for integration
    3. Make a table with the chemical shift for each carbon observed in this spectrum.

  2. DEPT 45 NMR Data (jdx, NUTS)
    1. Experimental Description - DEPT 45, Distortionless Enhancement of Polarization Transfer using a 45 degree decoupler pulse.
    2. Spectral Interpretation - This pulse sequence produces a carbon spectrum containing only carbons with protons attached (quaternary carbons are not observed).
    3. Compare the DEPT 45 data with the Carbon spectrum. On the table from the carbon spectrum, identify the quaternary carbons (those not found in the DEPT 45 spectrum.

  3. DEPT 90 NMR Data(jdx, NUTS)
    1. Experimental Description - DEPT 90, Distortionless Enhancement of Polarization Transfer using a 90 degree decoupler pulse.
    2. Spectral Interpretation - This pulse sequence produces a carbon spectrum containing only Methyne (CH) carbons.
    3. On the table from the carbon spectrum, identify the carbons observed in the DEPT 90 experiment as methyne (CH) carbons.

  4. DEPT 135 NMR Data(jdx, NUTS)
    1. Experimental Description - DEPT 135, Distortionless Enhancement of Polarization Transfer using a 135 degree decoupler pulse.
    2. Spectral Interpretation - This pulse sequence produces a carbon spectrum with methyl (CH3) and methyne (CH) carbons are up. Methene (CH2) carbons are down.
    3. On the table from the carbon spectrum, Identify the methene carbons (CH2) observed going down in the DEPT 135 spectrum, and the methyl (CH3)carbons observed going up but not seen in the DEPT 90.