BOILING-POINT RELATIONS IN THE HALOGENATED ETHANE SERIES

Patterns of boiling points among the fifty five halogenated ethanes are illustrated. The relative boiling points of the forty-six isomers in the system are summarized in terms of three rules depending simply on halogen distributions. The unknown boiling points of CH2FCCl3 and CH2FCHCl2 are estimated as 74.4+-1°C and 88.8+-1°C respectively from the patterns and rules. Variations in boiling points are rationalized mainly in terms of intermolecular repulsions between dipoles of the same kind, and attractions between dipoles of opposite polarity. © 1990.