12) Ylides X and XI can also undergo prototropic rearrangement as shown in eq 9 to shift the carbon-sulfur double bond to the position a to the carbonyl. However, reaction of these new ylides with HBF4 would also be expected to give sulfonium salts (VII and VIII).(13) On the basis of minimization of steric hindrance, photolysis of VII would be expected to give mainly and photolysis of VIII mainly (14) Gould, E. S. "Mechanism and Structure in Organic Chemistry"; Holt, Reinhart and Winston: New York, 1959; p 220.

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The microstructure of polyacetylene and its blends with elastomers, produced with the "Shirakawa" catalyst has been investigated using electron microscopic techniques. Structural richness of the as synthesized material and possibilities of its modification in the polyblends is emphasized