Give the structure that corresponds to the following molecular formula and 1H NMR spectrum: The magenta…
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Question “Give the structure that corresponds to the following molecular formula and 1H NMR spectrum: The magenta…”
Give the structure that corresponds to the following molecular formula and 1H NMR spectrum: The magenta numbers in the spectrum are the relative integrals in arbitrary units.
Answer
Concepts and Reason
1H NMR Spectroscopy:
Nuclear magnetic resonance
spectroscopy is one of the techniques in the analytical chemistry that is widely used to determine the purity of sample and to predict the structure of the organic compounds.
The
spectrum is phenominal. It is when frequency of nuclei in atoms (sample), resonates with frequency magnetic field.
Spectroscopy determines the different types of hydrogens (chemically non-equivalent hydrogens) present in a molecule.
Fundamentals
1HNMR Spin-Spin Coupling Designs:
Number of hydrogens that are chemically non-equivalent to each other
n
Number of peaks
(
)
Splitting Name
Ratio of peak heights
0
1
Singlet
1
2
Doublet
2
3
Triplet
3
4
Quartet
Here’s how to calculate the degree unsaturation
The
spectral data is given below:
Chemical shift
Multiplicity
Around 0.9ppm
Triplet
Around 1.38ppm
quartet
Around 1.42ppm
Singlet
Chemical shift – 1.42ppm: The
spectra shows quartet at 1.42ppm is due to the splitting of three hydrogens attached to carbon and there are three identical methyl groups.
Chemical shift – 1.38ppm: The singlet peak is observed at 1.38ppm disappear after shaking with
proton at
group of tertiary alcohol.
Chemical shift – 0.9ppm: The
spectra shows triplet at 0.9ppm is due to the splitting of two hydrogens attached to carbon shows this peak and three identical ethyl groups.
The compound therefore has one alcoholic and three identical
groups attached the the tertiary atom of carbon.
Below is the structure of the compound, with an assignment of chemical shifts values.
Ans:
The structure of the organic compound given is
Conclusion
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