DIPOLE-MOMENTS OF SOME BETA-DIKETONES AND MONOTHIO-BETA-DIKETONES

Dipole moments have been determined by static polarization measurement s for fiftyfive substituted beta-diketones and twelve aryl monothio-be ta-diketones having a fluoroalkyl, phenyl or aryl substituent. The var iations of the dipole moments with R on RCOCH(2)COR' and RCSCH(2)COR' is considered to be dependent on (a) the phenyl-X bond moment (b) the inductive effect of 4- and 3- substituents X on the phenyl group and ( c) the mesomeric effect of the substituent X. The R' groups are phenyl and the fluoroalkyls; CHF2,CF3,C2F5, C3F7, and the X-groups of phenyl are methoxy, ethoxy, methyl, ethyl, n-propyl, nitro, chloro, and fluo ro.