sodium tetrahydroborate in methanol T=0°C; 0.5 h;

Multi-step reaction with 3 steps 1.1: triphenylphosphine / tetrahydrofuran; water / 15 h1.2: 12 h2.1: (SPY-5-31)-dichloro-(κ2(C,O)-(2-isopropyloxybenzylidene))(1,3-bis(2,4,6-trimethylphenyl)-4,5-dihydroimidazol-2-ylidene)ruthenium / dichloromethane / 5 h / 20 °C3.1: Jorgensen's catalyst / methanol; 1,2-dichloro-ethane / 240 h / -25 °C