Organo-tin compounds S 4800Palladium-Catalyzed Stereoselective Hydrostannation of Substituted Propargyl Alcohols with Trineophyltin Hydride. -The Pd-catalyzed hydrostannation of propargylic alcohols (I) with the bulky trineophyltin reagent (II) is presented and the influence of substituents on the propargylic alcohol on the stereo-and regioselectivity is studied. In all cases, the addition proceeds syn-selectively, but the regioselectivity is determined by steric bulk of the substituents (rather than electronic effects). -(FARAONI, M. B.; GERBINO, D. C.; PODESTA*, J. C.; J.