Pyr*CrO3*HCl; Celite in dichloromethane 2.5 h; Ambient temperature;

1: 90 percent / pyridinium chlorochromate, Celite / CH2Cl2 / 2.5 h / Ambient temperature 2: 1.) n-butyllithium / 1.) THF, 0 deg C (0.5 h), -> room temperature (0.25 h), 2.) 0 deg C, 1.5 h View Scheme