Page 17 - Pharm.Org.Chem-I 02-06-05-101
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O O
C
CH RO
RO
O
C
RO
number of canonical structures stability
29
Inductive effect Resonance
occur only in occur in unsaturated and
saturated systems conjugated systems
It is the tendency of delocalization of es or
an atom or group of lone pair in a planar system
atoms to attract or
release electrons (parallel p orbitals)
transmission effect continue as long as
fades by increasing conjugation extends
distance
30
15
