Dipole moment data are often used for the determination of the structure of molecules containing two (or more) polar substituents. In such a case, the tacit assumption is being made that the moments of the substituents are "group constants" [1] and that the sigma network connecting the polar substituents does not transmit significantly dipole-dipole interaction. When the substituent groups are very close to each other, account has to be taken of their electrostatic interaction [2]; ...
![ethyl 4-chloro-5'-oxo-2',3',4',5'-tetrahydro-[1,1':3',1''-terphenyl]-4'-carboxylate Structure](https://image.chemsrc.com/caspic/236/23309-54-8.png)
