1: 88 percent / 35percent aq. H2O2 / ethanol / 2 h / Heating 2: 80 percent / 35percent aq. H2O2 / ethanol / 18 h / Heating 3: 1.) piperidine, 2.) camphor-10-sulfonic acid / 1.) methanol. reflux, 16 h, 2.) toluene, reflux, 2 h View Scheme

1: 73 percent / 24 h / 110 °C 2: 88 percent / 35percent aq. H2O2 / ethanol / 2 h / Heating 3: 80 percent / 35percent aq. H2O2 / ethanol / 18 h / Heating 4: 1.) piperidine, 2.) camphor-10-sulfonic acid / 1.) methanol. reflux, 16 h, 2.) toluene, reflux, 2 h View Scheme

1: 80 percent / 35percent aq. H2O2 / ethanol / 18 h / Heating 2: 1.) piperidine, 2.) camphor-10-sulfonic acid / 1.) methanol. reflux, 16 h, 2.) toluene, reflux, 2 h View Scheme

piperidine; toluene-4-sulfonic acid 1) MeOH, reflux, 16 h, 2) toluene, 16 h, reflux; Yield given. Multistep reaction;

sodium hydride in diethyl ether 0.5 h; Heating;

sodium hydride in diethyl ether 3 h; Heating;

sodium hydride in toluene 1.5 h; Heating;