acetyl chloride in chloroform Ambient temperature;

[RhCl(η2:η2-cycloocta-1,5-diene)]2; hydrogen; toluene-4-sulfonic acid; 9,9-dimethyl-4,5-bis(diphenyl-phosphino)xanthene in diethylene glycol dimethyl ether T=80°C; P=60006 Torr; 10 h; AutoclaveSchlenk techniqueInert atmosphere; Time;

in chloroform T=0°C; 2 h; Yield given;