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Para‐Conjugation in Aromatic Systems and the Correlation between Mo Bond Order and the Resonance Structures Cheng
Author(s) -
Chen Chen
Publication year - 1973
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.197300001
Subject(s) - chemistry , resonance (particle physics) , benzene , naphthalene , ring (chemistry) , bond order , aromaticity , crystallography , computational chemistry , stereochemistry , molecule , bond length , organic chemistry , crystal structure , atomic physics , physics
A simple correlation between the MO bond orders and the resonance structures of a π system is proposed. Para conjugation is a resonance structure with parallel arrangement of alternating attractive and repulsive bonds. The results in C 5 H 5 − , C 6 H 6 and C 7 7 + clearly show that the para conjugation is very important comparing with the ordinary ring conjugation. The aromatic substitution reactions strongly demomstrates the effect of para conjugation in benzene, naphthalene and anthrance.