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Ch_322a_4.022

Ch_322a_4.022 - The Index of Hydrogen Deficiency Useful...

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The Index of Hydrogen Deficiency Useful structural information is available from the molecular formula of a hydrocarbon. The general formula of an alkane is C n H 2n + 2 . The general formula of an alkene is C n H 2n . The presence of a double bond is revealed by a deficiency of 2H in the molecular formula. CH 3 CH 2 CH 2 CH 3 CH 3 CH 2 CH=CH 2 C 4 H 10 C 4 H 8 The missing 2H also is called one degree of unsaturation or 1U . A cycloalkane has one degree of unsaturation. C n H 2n CH 3 CH 2 CH 2 CH 3 C 4 H 10 CH 2 -CH 2 CH 2 -CH 2 C 4 H 8
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Degrees of Unsaturation Each double bond or ring in a structure adds one degree of unsaturation or 1 U. CH 2 =CH-CH=CH 2 C 4 H 6 Since the formula C 4 H 10 is"saturated," C 4 H 6 has 2U . (2U) Examples cyclohexene (C 6 H 10 ) 2 U CH=CH 2 1-vinylcyclopentene (C 7 H 10 ) 3 U CH 3 C CH propyne (C 3 H 4 ) 2 U
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Index of Hydrogen Deficiency Rings and multiple bonds may be distinguished by the
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Ch_322a_4.022 - The Index of Hydrogen Deficiency Useful...

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