1: 66 percent / methanolic KOH / 2 h 2: 58 percent / pyridinium dichromate / 1,2-dimethoxy-ethane / 24 h View Scheme

potassium hydroxide in methanol

1: 66 percent / methanolic KOH / 2 h 2: 58 percent / pyridinium dichromate / 1,2-dimethoxy-ethane / 24 h 3: 1.) methyllithium / 1.) ether, THF, -92 deg C, 0.75 h, 2.) to room temp. View Scheme