zirconium tetrachloride in dichloromethane 0.25 h; Ambient temperature;

1.1: n-butyllithium / hexane; diethyl ether / 0.5 h / -78 °C / |Inert atmosphere 1.2: 0.5 h / -78 °C / |Inert atmosphere 1.3: |Inert atmosphere 2.1: sodium sulfate; silica gel / hexane; tetrahydrofuran; diethyl ether / 0.17 h / |Inert atmosphere View Scheme

1: 1.) H+ / 2.) heating 2: 1.) lead tetraacetate, BF3*Et2O, 2.) H2SO4 / 1.) room temperature, 2 h, 2.) H2O, 1 h. View Scheme

lead(IV) acetate; sulfuric acid; boron trifluoride diethyl etherate 1.) room temperature, 2 h, 2.) H2O, 1 h.; Multistep reaction;

furan; triethylamine Ambient temperature; Mechanism;

IrradiationPh2CO as additive; Product distributionMechanism;