CH 221 Calculating Units of Unsaturation

CH 221 Calculating Units of Unsaturation - CH 221 Organic...

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CH 221 Collegeof the Holy Cross Prof. Gail Edwards Organic Chemistry I Calculating Units of Unsaturation (U) Spring 2008 Given a molecular formula with no overall charge and containing no atoms other than carbon and hydrogen or carbon, hydrogen and oxygen calculate the molecular formula of a completely saturated molecule containing the same number of carbon atoms and compare it with the given molecular formula. For example, given a molecular formula C 6 H 10 , calculate the formula of the completely saturated counterpart using the formula C n H 2n+2 . For a compound containing 6 carbon atoms (n = 6), the completely saturated version would be C 6 H 14 . The given molecular formula contains 4 fewer hydrogens than the completely saturated version. Thus, there are two units of unsaturation. If oxygen is present, it is ignored. For charged molecules the molecular formula is altered according to the rules outlined below before it is compared with the completely saturated version. Given a molecular formula
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CH 221 Calculating Units of Unsaturation - CH 221 Organic...

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