The reaction typically involves the use of a strong base (such as sodium ethoxide, sodium hydride, or a similar reagent) to deprotonate the hydrogen adjacent to the sulfur in the arylthio group. This generates a nucleophilic sulfur species that can attack the adjacent carbon, leading to the formation of a new double bond.
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Potassium; (E)-2-carbamoyl-ethenolate
HCl
benzaldehyde N,N-dimethyl-N-(p-bromobenzyl)hydrazonium bromide
