Nmr Interpration Methods

1. NMR Interpretation
Prepared By :
Ganesh Shashikant Shinde
Pravara Rural college of
pharmacy,pravaranagar

3. 1 1:1
2 1:2:1
3 1:3:3:1
4 1:4:6:4:1
5 1:5:10:10:5:1
6 1:6:15:20:15:6:1

4. Degreeof unsaturation
Because of the presence of a double bond, alkenes have
two fewer hydrogens than the corresponding parent
hydrocarbon.
For example, ethene (H2C=CH2) has the molecular
formula C2H4 and ethane (CH3CH3) has the formula
C2H6 (following the 2n + 2 rule).
Cycloalkanes, likewise, have two fewer hydrogen's than
the parent hydrocarbon since two of the valences are
utilized to close the ring: cyclohexane is C6H12, while
hexane is C6H14.

5. Knowing this relationship, it is possible to take a molecular
formula and calculate the degree of unsaturation; that is, the
total numberof multiple bonds orrings in a molecule.
This information can then be utilized in the conversion of
analytical data intostructural possibilities.
For hydrocarbons, the process is simple:
take the parent hydrocarbon and calculate the number of
hydrogens using the 2n + 2 rule,
every two hydrogens that are "missing" in the analysis of the
unknown represents one degree of unsaturation (DU).

8. 2-pentanone, C5H10O

22. 3-methylaniline

26. 4-t-butylbenzoic acid

28. 5-methyl-2-isopropylphenol
also known as thymol

32. 3-butyl pyridine