Combined Effects of Metal and Ligand Capable of Accepting a Proton or Hydrogen Bond Catalyze Anti-Markovnikov Hydration of Terminal Alkynes The support of San Diego State University is acknowledged.

In the second paragraph of the communication by D. B. Grotjahn et al. (Angew. Chem. Int. Ed. 2001, 20, 3884–3887), previous work on complexes of electron-rich or chelating ligands with the CpRuCl fragment was reported (T. Suzuki, M. Tokunaga, Y. Wakatsuki, Org. Lett. 2001, 3, 735–737). The best catalyst in this work was the complex [CpRuCl(Ph2PCH2PPh2)] and not the complex [CpRuCl(Me2PCH2PMe2)] given as an example. Thus, the first sentence of the following paragraph should be: “In contrast, here we report that electron-rich or chelating phosphanes are not needed.” The authors apologize for the error.