MICROWAVE SPECTRUM, CONFORMATIONAL ANALYSIS, AND BARRIERS TO INTERNAL ROTATION OF CIS-1-FLUORO-2-BUTENE
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Date
1988
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Publisher
Ohio State University
Abstract
The microwave spectrum of cis-I-fluoro-2-butene has been recorded in the region 12.0 to 39.0 GHz. A-type R-branches have been observed and assigned for the ground state for the gauche conformer. The determined rotational constants for this conformer were found to have the following values: $A 12,681.38 \pm 8.59, B = 2541.16 \pm 0.05$ and $C = 2309.62 \pm 0.04 MHz$. From the Stark effect the dipole moment components were determined to be $|\mu_{a}|=1.91 + 0.02, |\mu_{b}1.07 \pm 0.01, |\mu_{c}|=0.31 \pm 0.01$ and $|\mu_{t}|=2.21 \pm 0.02$. Barriers to rotation have been determined as well as conformational stability. These results will be compared to the corresponding quantities obtained from ab initio calculations as well as those for trans-1-fluoro-2-butene and methacryloyl fluoride.
Description
Author Institution: Departments of Chemistry and Physics, The University of the South; Department of Chemistry, University of South Carolina