1.1
 
 
 
 Reagents:
 
 
 
 Butyllithium
 
 
 
 
 
 
 
 
 
 
 
 
 Solvents:
 
 
 
 Tetrahydrofuran
 
 
 
 
 
 
 
 
 
 ; 
 -15 °C; 10 min, -15 °C 
 1.2
 
 
 
 Reagents:
 
 
 
 Chlorotrimethylsilane
 
 
 
 
 
 
 
 
 
 
 
 
 
 ; 
 -15 °C → rt 
 1.3
 
 
 
 Reagents:
 
 
 
 Sodium chloride 
 1.4
 
 
 
 Reagents:
 
 
 
 Oxygen
 
 
 
 
 
 
 
 
 
 
 
 
 Solvents:
 
 
 
 Dichloromethane
 
 
 
 
 
 
 
 
 
 ; 
 2 min, 0 °C 
 
 
 
 
 
 
 
 
 
 
 
 