A stable thio-analogue of a Meisenheimer complex via a spiroannelation route: requirements for annelating chain length
Abstract
2-Picrylthioethane-1-thiol undergoes exclusive intramolecular cyclization to give a crystalline spiro thio-analogue of a Meisenheimer complex under the action of a base, whereas nitro group replacement by thiolate occurs with the propanedithiol analogue.