1: 81 percent / AlMe3 / toluene / 25 °C 2: 92 percent / DMAD / PPh3 / tetrahydrofuran / 25 °C / different reaction partner 4: 81 percent / Li, / tetrahydrofuran; 2-methyl-propan-2-ol; various solvent(s) / -40 °C 5: CrO3, / pyridine / 25 °C View Scheme

Multi-step reaction with 3 steps 1: 81 percent / AlMe3 / toluene / 25 °C2: 92 percent / DMAD / PPh3 / tetrahydrofuran / 25 °C / different reaction partner  

Multi-step reaction with 2 steps 1: 81 percent / AlMe3 / toluene / 25 °C2: 92 percent / DMAD / PPh3 / tetrahydrofuran / 25 °C / different reaction partner  

Multi-step reaction with 3 steps 1: 81 percent / AlMe3 / toluene / 25 °C2: 92 percent / DMAD / PPh3 / tetrahydrofuran / 25 °C / different reaction partner