1: 33 percent / H2 / [Rh(OAc)2]2; BIPHEPHOS / benzene / 20 h / 80 °C / 20701.7 Torr 2: 60 percent / 1.5 M DIBAL-H / toluene / Heating View Scheme

hydrogen; dirhodium tetraacetate; triphenylphosphine in benzene T=80°C; Hydroformylation; cyclocondensation; P=20701.7 Torr; 20 h;