5‐(Pyrrolidine‐2‐yl)tetrazole: Rationale for the Increased Reactivity of the Tetrazole Analogue of Proline in Organocatalyzed Aldol Reactions

On page 4293 of our original article,1 we reported a specific optical rotation of the catalyst 5-(2S)-pyrrolidine-2-yl-1H-tetrazole (1) of αDr.t. = –1.1 (c = 1, CH3OH). Upon re-measuring this value on the same spectropolarimeter, but with a new lamp, we now obtained the value αDr.t. = –8.8 (c = 1.00, CH3OH). We apologize to all readers for any confusion this error might have caused, and are grateful to Dr. D. Longbottom and Prof. Dr. S. V. Ley for bringing this error to our attention. The Authors