1: dirhodium(II) tetrakis(perfluorobutyrate) / toluene / 15 h / 90 °C / Inert atmosphere; Molecular sieve 2: potassium hydroxide / water / 2 h / 90 °C / Inert atmosphere 3: N,N-dimethyl-formamide / 15 h / 60 °C / Inert atmosphere 4: sodium tetrahydroborate / methanol; water / Inert atmosphere View Scheme

1: dirhodium(II) tetrakis(perfluorobutyrate) / toluene / 15 h / 90 °C / Inert atmosphere; Molecular sieve 2: sodium tetrahydroborate / methanol; water / 20 - 100 °C / Inert atmosphere View Scheme