Abstract
A conformational ab initio MO study has been carried out for the thiathiophthene molecule (TTP) and two related model compounds, thiomalonaldehyde (TMA) and its conjugate base (TMA(-)). The conformational energy surfaces for TMA, TMA(-) and TTP were generated using a least squares fit to the calculated data and plotted on a CALCOMP plotter. The results of the calculations showed that the cis-cis planar conformation of TTP is the most stable in agreement with experimental findings. For TMA and TMA(-) the cis-cis planar conformation is not the most stable. Contour plots of the five occupied π-MO's of TTP show great similarity to those of naphthalene.
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