(a) S 8 O can be prepared by treating S 8 with CF 3 CO 3 H The structure of S 8 O is shown below Explain why the addition of one O atom to the S 8 ring reduces the molecular symmetry from D 4 d to C 1 (b) The reaction between TeF 4 and Me 3 SiCN leads to the formation of Me3SiF and substitution pro...

a The molecular symmetry of a compound refers to the arrangement of its atoms and how it can be transformed into itself by symmetry operations such as rotations reflections and inversions In this case ...

(a) S 8 O can be prepared by treating S 8 with CF 3 CO 3 H....

Question:

(a) S₈O can be prepared by treating S₈ with CF₃CO₃H. The structure of S₈O is shown below. Explain why the addition of one O atom to the S₈ ring reduces the molecular symmetry from D₄_d to C₁.

(b) The reaction between TeF₄ and Me₃SiCN leads to the formation of Me3SiF and substitution products TeF_4–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, J 2012 Hz), δ 816 ppm (triplet, J 187 Hz), δ 332 ppm (doublet, J 200 Hz). The ¹⁹F NMR spectrum of the same mixture at 173K exhibits three signals, each with ¹²⁵Te satellites. Rationalize the observed spectra (including comments on fluxional species where appropriate), and suggest structures for the products.