1: TiCl4 / CH2Cl2 / Ambient temperature 2: Zn 3: 80 percent / HClO4, HBr View Scheme

<b>Multi-step reaction with 2 steps<br /> </b>1: Pd(OAc)2<br />2: 60 percent / acetonitrile / trans/cis ratio 7:1<br /> <br /> &nbsp;