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Understanding Benzannulenes
Author(s) -
Mitchell Reginald H.
Publication year - 1980
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.198000087
Subject(s) - chemistry , annulene , annulation , ring (chemistry) , computational chemistry , stereochemistry , organic chemistry , catalysis
Abstract The effect on NMR data when annulenes are benzannelated is discussed for forty‐three compounds. It is shown that benzannelation reduces the diatropicity or paratropicity of the macrocyclic system and the reasons for this in terms of increased bond localisations in the macrocylic ring are indicated. Examples are discussed where no decrease in diatropicity is found to occur on dibenz (naphth)annelation, and these are shown to be consistent with no change in bond orders.