Nontoxic cyanide source: An unprecedented route to acrylonitriles by employing propargylic alcohols and para‐tolylsulfonohydrazide as a combined cyanosource has been developed (see scheme). This efficient and practical cyanation reaction proceeds through an FeCl3‐catalyzed domino propargylic substitution/aza‐Meyer–Schuster rearrangement sequence, the rearrangement process of which is reported for