aromatic aldehyde; dirhodium tetrakis(pivalate) in dichloromethane T=-78 - 20°C;

1.) 12 h, dichloromethane; 2.) 1 h; Yield given. Multistep reaction. Yields of byproduct given;

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1: 79 percent / diethyl ether / 48 h / Ambient temperature 2: 88 percent / trimethyl phosphite / CHCl3 / 48 h / Heating 3: 75 percent / benzene / 18 h / Irradiation 4: 78 percent / diethyl ether / 1.5 h 5: potassium hydrogen sulphate / 0.5 h / 80 °C / 10 Torr View Scheme