摘要:
                                Ultrasound-promoted zincation of 2-chloro-4-bromo-2-sulfolene (10) with benzoyloxyacetaldehyde (6), followed by base-induced hydrolysis, intramolecular conjugate addition and aromatization, gives the 3-sulfolene (4) which is a stable precursor to the furan analogue of o-quinodimethane.