1: 74 percent / potassium tert-butoxide / 2-methyl-propan-2-ol / 6 h / Heating 2: 50 percent / 1.) 110-125 deg C, 2h, 2.) RT, overnight View Scheme

1: 48 percent / acetone / 24 h / Heating 2: 74 percent / potassium tert-butoxide / 2-methyl-propan-2-ol / 6 h / Heating 3: 50 percent / 1.) 110-125 deg C, 2h, 2.) RT, overnight View Scheme

1.) 110-125 deg C, 2h, 2.) RT, overnight;