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Molybdenum-Catalyzed Hydrostannations of Allenoles U. Kazmaier, M. Klein Chem. Commun. 2005, 501-503. Allenylcarbinols undergo regioselective hydrostannation in the presence of MoBl3, a catalyst which was developed for the hydrostannation of propargyl alcohols and derivatives. Allenylcarbinols are more reactive than alkynes and therefore milder reaction conditions are possible. This allows to suppress side reactions, such as eliminations. Allylstannes are formed preferentially, which can easily be converted into allyl iodides.