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The reaction of 5‐hydroxy‐1‐pyrrolines with arenes in TfOH at room temperature for 1 h afford 5‐aryl‐1‐pyrrolines in 55–98 % yields. 5‐Hydroxy‐1‐pyrrolines in TfOH or H2SO4 at room temperature for 0.5–1 h undergo dehydration with the formation of N‐protonated forms of 3H‐pyrroles, which were characterized by NMR. Upon hydrolysis, the N‐protonated species give quantitatively the corresponding 3H‐pyrroles...
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