1: potassium carbonate / water; acetone / 0.5 h / 0 - 20 °C 2: palladium on carbon; hydrogen / methanol / 20 °C 3: 2,2,6,6-tetramethyl-piperidine-N-oxyl; 1-methylcyclopentane; trichloroisocyanuric acid; sodium hydrogencarbonate; sodium bromide / acetone View Scheme

1: 88 percent / Et3N / CH2Cl2 / 2 h / 20 - 25 °C 2: 100 percent / H2 / 5percent Pd/C / ethanol / 9 h / 70 °C View Scheme

hydrogen; palladium on activated charcoal in ethanol T=50°C;