Illustrated Glossary of Organic Chemistry
DBE = UN = PBoR = C - (H/2) + (N/2)
where: C = number of carbon atoms, H = number of hydrogen and
halogen atoms, and N = number of nitrogen atoms.
One DBE = one ring
or one double
bond. Two DBE = two rings,
bonds, or one triple
bond, or one ring
plus one double
bond. A benzene
ring requires four DBE (one for the ring
plus one for each C=C).