Regioselective Head-to-tail Coupling of Allylic Trialkylstannanes with Allylic Halides under High Pressure1 ... Yoshinori Yamamoto,*a Kazuhiro Maruyama,a and Kiyoshi Matsumotob a Department of Chemistry, Faculty of Science and College of Liberal Arts and Science, Kyoto University, Kyoto 606, Japan ... Allylic trialkylstannanes (1) regioselectively react with allylic halides (2) at room temperature under high pressure (10 kbar) to give head-to-tail coupling products (3) in ...