Pyrazoles direct: Propargyl alcohols undergo hydrazination when treated with p‐tosyl hydrazide in the presence of catalytic amounts of either Sc(OTf)3 or La(OTf)3 (see scheme; Tf=trifluoromethanesulfonyl). Propargylhydrazides are converted into either N‐tosyl or N‐H pyrazoles when treated with an acid or a base, respectively. The one‐step acid‐catalyzed hydrazination/cyclization of propargyl alcohols