The relationship between 19F chemical shifts in halogenated propanes and their structures are elucidated using MNDO calculations to determine the population of rotamers. The pairs of atoms gauche to a fluorine atom and van der Waals interaction between the two terminal substituents are responsible for the 19F chemical shifts. The differences among chemical shifts in diastereomers are also discussed
Hydrofluorocarbons (HFCs) have been fluorinated via the high-valency metal fluoridesCoF3, MnF3 and KCoF4. The fluorinating powers of these reagents for the monofluorinationof 2,2-difluoropropane are in the order CoF3 > MnF3 > KCoF4. The fluorinations of fluorinatedethanes with CoF3 have been examined in detail. The effects of temperature andthe distribution of products are described. Furthermore, regioselective