VIBRATIONAL-SPECTRA, RING-PUCKERING POTENTIAL-ENERGY FUNCTION, AND CONFORMATION OF 1,3-DISILACYCLOPENT-4-ENE
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abstract
1,3-Disilacyclopent-4-ene has been synthesized and its far-infrared, mid-infrared, and Raman spectra have been analyzed. From the far-infrared data of the molecule in the vapor phase, which shows a series of 10 bands between 48 and 85 cm-1, the ring-puckering potential energy surface was determined to be V (cm-1) = 1.48 105x4 + 0.30 104x2, where x is the ring-puckering coordinate in angstroms. This shows the molecule to be planar but to be not nearly as rigid as silacyclopent-2-ene. Other features in the infrared, Raman, and NMR spectra confirm that the interactions between the silicon atoms and the carbon-carbon double bond, while present, are reduced relative to silacyclopent-2-ene. 1991 American Chemical Society.