Abstract
The effects of Lewis acid, solvent and orthothio substituent have been examined with regard to intramolecular electrophilic aromatic substitution ( annulation ) with bisthiocarbocations . A suspension of silver trifluoromethanesulfonate in dichloromethane, creating bis ( arylthio ) carbocations, was found to be the most effective for annulation of six- membered rings.

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