Round 3: Tossup 9

Hydrosilanes exchange these entities when reacted with metal alkyls in a reaction observed in lutetium methyl complexes by Patricia Watson. Whether these entities interchange or migrate to new sites differentiates type I and type II of one reaction class. Two of these entities are either added or removed at one atom in cheletropic reactions. Platinum chloride complexes (*) “activate” these entities in the Shilov system. Woodward-Hoffmann (10[1])notation uses an order term in square brackets denoting the shift in these entities in a namesake type of pericyclic (-5[1])reaction. In a namesake rule, the number of these bonds in a molecule equals the number of atoms plus the number of rings minus one. For 10 points, name these covalent bonds formed by overlapping orbitals, (-5[2])which in double bonds (-5[1])exist alongside a pi-bond. ■END■ (10[4])

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