Functional groups Fused” benzene rings

Anthranilic acid and its lower alkyl esters 5 or 2-aminobenzamide react with guanidine, imidates,formimidamide acetate, or chloroformimidamide to give the corresponding quinazolin-4(3//)-ones 6 which can bear a variety of substituents and/or functional groups at the 2-position and in the benzene ring or can be fused with an additional benzene ring. The reaction requires reflux conditions in methanol, ethanol, or bis(2-methoxy-... 

The benzoquinoxalinobarrelene 86 with methoxy functionalities at the 1,4-positions of the benzene moiety photorearranges to 87 and 88 in a 1 1 ratio, indicating that benzo and quinoxalino groups are in equal competition (Equation 32.15). A hvefold enhancement of the DPM mode is observed in the reactions of 86 in comparison with those of 78 (see Equation 32.14). This enhancement arises from the introduction of methoxy groups in the benzene ring of 78. As in the case of 43, the hydroquinone-fused barrelene 89 did not undergo photoisomerization under direct or sensitized excitation (Equation 32.16). 

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