Organic Chemistry Practice Problems Degrees of Unsaturation Practice Problems Solution: Determine the index of hydrogen deficiency (degree...

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Solution: Determine the index of hydrogen deficiency (degrees of unsaturation) for the following molecule.Antipsychotic - Haloperidol = C21H23NO2ClF

Problem

Determine the index of hydrogen deficiency (degrees of unsaturation) for the following molecule.

Antipsychotic - Haloperidol = C21H23NO2ClF

Solution

We’re being asked to determine the index of hydrogen deficiency (IHD) for haloperidol, C21H23NO2ClF.

Recall that the degrees of unsaturation or index of hydrogen deficiency (IHD) tell us how many hydrogens are missing in a structure.

For a given molecular formula, the IHD is calculated using:

$\overline{){\mathbf{IHD}}{\mathbf{=}}\frac{\left[2n+2\right]\mathbf{-}\mathbf{H}}{\mathbf{2}}}$

where n = number of carbons and H is:

+1 for hydrogen (H) or halogens (X)

0 for oxygen (O)

–1 for nitrogen (N)

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