1.1: 96 percent / LiAl(Ot-Bu)3H / ethanol / 0.25 h / -78 °C 2.1: 97 percent / aq. HCl / methanol / 0.25 h / 20 °C 3.1: CF3COOH / CH2Cl2 / 1.5 h / 0 °C 3.2: 47 percent / aq. NaOH / CH2Cl2 / 0.33 h / 0 °C / pH 9 4.1: 56 percent / (N,N'-Mes2-imidazolidin-2-yl)Ru=CHPh(PCy3)Cl2 / CH2Cl2 / 2 h / Heating View Scheme

1: 96 percent / LiAl(Ot-Bu)3H / ethanol / 0.25 h / -78 °C 2: 97 percent / aq. HCl / methanol / 0.25 h / 20 °C 3: 58 percent / (N,N'-Mes2-imidazolidin-2-yl)Ru=CHPh(PCy3)Cl2 / CH2Cl2 / 2 h / Heating View Scheme

1.1: 96 percent / LiAl(Ot-Bu)3H / ethanol / 0.25 h / -78 °C 2.1: 97 percent / aq. HCl / methanol / 0.25 h / 20 °C 3.1: 64 percent / CBr4; pyridine / 3 h / 0 °C 4.1: CF3COOH / CH2Cl2 / 1.5 h / 0 °C 4.2: 80 percent / aq. NaOH / CH2Cl2 / 0.33 h / 0 °C / pH 9 5.1: 55 percent / (N,N'-Mes2-imidazolidin-2-yl)Ru=CHPh(PCy3)Cl2 / CH2Cl2 / 2 h / Heating 6.1: 70 percent / methanol / 5 h / 50 °C View Scheme