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

摘要

Dipole moments have been determined by static polarization measurements for fiftyfive substituted beta-diketones and twelve aryl monothio-beta-diketones having a fluoroalkyl, phenyl or aryl substituent. The variations 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 fluoro. [References: 16]