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A simple and facile catalyst-free method for the construction of α-thioacrylic acids has been developed from readily-available aryl alkynoates and thiols at room temperature. Various α-thioacrylic acids could be conveniently and efficiently obtained in moderate to good yields via cascade thiolation and 1,4-aryl migration of aryl alkynoates in the absence of any catalyst and additive.
Wei et al. (Mon,) studied this question.