ring and double bond equivalent

https://doi.org/10.1351/goldbook.12561
Conventional measure of the degree of unsaturation of an organic molecule given by \(X - Y/2 + Z/2 + 1\) where \(X\) is the number of carbon atoms, \(Y\) is the number of hydrogen or halogen atoms and \(Z\) is the number of nitrogen and phosphorus atoms.
Source:
PAC, 2013, 85, 1515. (Definitions of terms relating to mass spectrometry (IUPAC Recommendations 2013)) on page 1588 [Terms] [Paper]
Citation: 'ring and double bond equivalent' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.12561 RIS BibTex EndNote
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