1,4-Cyclohexadiene was easily transformed into 4,5-dichlorocyclohexene, 2, 18 via its essentially quantitative reaction with SO 2 Cl 2 in CCl 4 at room temperature. This was followed by the key step in the synthesis, which was the introduction of the SF 5 group via the high yield, Et 3 B-catalyzed addition of SF 5 Cl to 2 at −20 °C. To obtain the reported high yield, it was essential that a longer reaction time and larger (3.5-fold) excess of SF 5 Cl be used for this addition, in ...
