The formula for rings plus pi bonds indicates the degree of unsaturation for a chemical molecule.
Overview:
Molecule selection: contains only carbon, hydrogen, nitrogen, oxygen and monovalent halogens.
Parameters:
(1) number of carbons
(2) number of nitrogens
(3) number of hydrogens
(4) number of monovalent halogens
formula for rings plus pi bonds =
= (number of carbons) + 1 + (0.5 * ((number of nitrogens) - (number of hydrogens) - (number of monovalent halogens)))
Structure
Degrees of Unsaturation
ring
1
double bond
triple bond
2
benzene ring
4 (1 ring plus 3 pi bonds)
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Specialty: Clinical Laboratory
