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Derives an equation to calculate degrees of unsaturation in hydrocarbons, highlighting its educational use.
Starting with a generalized chemical formula of a hydrocarbon, a two-sided equation is derived that shows how the four variables that describe any hydrocarbon are related. For a given hydrocarbon, one side of the equation is the sum of π bonds and rings, and the other side is one more than the number of carbon atoms minus half of the hydrogen atoms. Both sides equal the degrees of unsaturation (DU) in the hydrocarbon. The derived equation is expanded to include heteroatoms, and the use of the two equations in sophomore organic chemistry structural and DU problems is exemplified.
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Ray A. Gross (2003) studied this question.
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