OZONOLYSIS OF CIS- AND TRANS-1,2-DIFLUOROETHYLENE: MICROWAVE SPECTRUM OF CIS, TRANS-1,2,3-TRIFLUOROCYCLOPROPANE

Abstract

The microwave spectrum of cis, trans-1,2,3-trifluorocyclopropane, $CHFCHFCFH^{1}$, was investigated in the region of 26.5 = 40.0 GHz, From the assignment of $\mu_{a}$ and $\mu_{e}$ type R-branch transitions the following rotational constants (MHz) were obtained for the ground vibrational state: $A=4755,000 \pm 0.005, B=3145,729 \pm 0.002$ and $C = 2114.071 \pm 0.002$. The electric dipole moment was measured to be $\mu_{a} = 1.146 \pm 0.015$ Debye, $\mu_{c} =1.818 \pm .032$ Debye and $\mu_{T} = 2.149 \pm .035$ Debye. In addition, microwave transitions were assigned for a vibrationally excited state. Five deuterated isotopes of CHFCHFCFH were synthesized by the reaction of ozone with appropriately deuterated samples of 1,2-difluoroethylene, These include CHFCHFCFD, CHFCDFCFH, CDFCDFCFH, CDFCHFCFD, and CDFCDFCFD. The assignment of the microwave spectra of all five deuterated species has provided information related to the mechanism of cyclopropane formation in ozonolysis reactions. The results will be discussed in terms of carbene addition to the olefin. [FIGURE]