Novel Electron Acceptors Bearing a Heteroquinonoid System. 4. Syntheses, Properties, and Charge-Transfer Complexes of 2,7-Bis(dicyanomethylene)-2,7-dihydrobenzo[2,1-b:3,4-b']dithiophene, 2,7-Bis(dicyanomethylene)-2,7-dihydrobenzo[1,2-b:4,3-b']dithiophene, and 2,6-Bis(dicyanomethylene)-2,6-dihydrobenzo[1,2-b:4,5-b']dithiophene

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