(a) S8O can be prepared by treating S8 with CF3CO3H. The structure of S80 is shown below....

(a) S8O can be prepared by treating S8 with CF3CO3H. The structure of S80 is shown below. Explain why the addition of one 0 atom to the S8 ring reduces the molecular symmetry from D4d to C1.

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(b)               The reaction between TeF4 and Me3SiCN leads to the formation of Me3SiF and substitution products TeF4-n(CN)n. When the 125Te NMR spectrum of a mixture of TeF4 and less than four equivalents of Me3SiCN is recorded at 173 K, three signals are observed: δ 1236 ppm (quintet, ./ 2012 Hz), 8 816 ppm (triplet, J 187 Hz), δ 332 ppm (doublet, J 200 Hz). The 19;F NMR spectrum of the same mixture at 173 K exhibits three signals, each with l25Te satellites. Rationalize the observed spectra (including comments on fluxional species where appropriate), and suggest structures for the products.