Thursday, 21 January 2016

organic chemistry - Is 1,2-dihydronaphthalene "partially aromatic"?



I've learned that if any one ring of a structure like the below is aromatic, the whole compound is aromatic.



1,2-dihydronaphthalene


But one of my friends suggested that such compounds cannot be aromatic and gave the following resonance structures as the reason:


resonance delocalisation in 1,2-dihydronaphthalene


I feel that the non-aromatic/anti-aromatic resonance structures wouldn't make significant contribution. Is my reasoning correct?




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