A novel platinum‐catalyzed asymmetric ring‐opening reaction of oxabenzonorbornadiene with terminalalkynes is described. The reaction affords optically active cis‐2‐alkynyl‐1,2‐dihydronaphthalen‐1‐ols in moderate yields with good enantioselectivity in the presence of catalytic amounts of Pt(COD)Cl2/(S)‐BINAP and an excess of zinc powder. The products were obtained exclusively with the relative cis‐configuration