Everything about The Degree Of Unsaturation totally explained
The
degree of unsaturation (also known as the
index of hydrogen deficiency (IHD) or
rings plus double bonds) formula is used in
organic chemistry to help draw chemical structures. The formula lets the user determine how many rings, double bonds, and triple bonds are present in the compound to be drawn. It doesn't give the exact number of rings or double or triple bonds, but rather the sum of the number of rings and double bonds plus twice the number of triple bonds. The final structure is verified with use of
NMR,
mass and
IR spectroscopy, as well as inspection. The formula for degree of unsaturation is
»
where
is the numbers of
carbon atoms,
is the numbers of
hydrogen atoms,
is the numbers of
halide atoms, and
is the numbers of
nitrogen atoms. Do not count group VI elements such as oxygen and sulfur atoms (but count H groups attached to oxygen atoms, such as
hydroxyl groups).
Halogen atoms (F, Cl, Br, I) count as H atoms for degree of unsaturation calculations.
The degree of unsaturation is used to calculate the number of rings and
pi bonds, where
- Rings count as one degree of unsaturation
- Double bonds count as one degree of unsaturation
- Triple bonds count as two degrees of unsaturation
Further Information
Get more info on 'Degree Of Unsaturation'.
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