Packet 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. (-5[1])Two of these entities are either (-5[2])added or removed (-5[1])at one atom (-5[1])in (15[1])cheletropic reactions. (-5[2])Platinum chloride (-5[1])complexes (15[1])(*) “activate” these entities in the Shilov system. (10[3]-5[1])Woodward-Hoffmann (10[2])notation (10[2])uses an order term in square brackets denoting the shift in these entities (-5[2])in a (-5[1])namesake type of (10[1])pericyclic (-5[1])reaction. In a (-5[1])namesake rule, (10[3])the number of these bonds in (10[1])a molecule (10[1])equals the number of atoms plus the number of rings minus one. (-5[1])For 10 points, name these covalent bonds formed by overlapping orbitals, (-5[4])which in (10[1]-5[1])double bonds (-5[3])exist alongside a pi-bond. (10[2])■END■ (10[23]0[1])

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