Anti-quinoid

Results on benzene have shown that it has an anti-quinoidal structure (79) in CD but a quinoidal structure... 

Flash photolysis of aromatic nitro compounds was carried out by a number of authors Wettermark (40). Suryanarayanan. f apellos. Porter anti co-workets [41-4,1]. Among various findings the latter authors came to the conclusion that 2,4,6-trinitrotoluene under flash photolysis is transformed into aci-quinoid isomer (1) with an absorption maximum at 460 nm. 

Benzene displays a symmetric Cs symmetry) S /So conical intersection between states that correlate with the E2g state 2 in the FC region) and the ground state of the planar equilibrium structure. hS9-92 Scheme 12, we show that the electronic character of the anti-aromatic (i.e. difference of the two Kekule structures indicated with a dashed circle) Si surface B2u) changes along the reaction path due to an avoided crossing between the S2 and Si states. The S2 CE2g) state can be described by a combination of quinoid (Dewar type) and antiquinoid spin couplings. As seen in Fig. 8(a)... 

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