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3.14 Polycyclic Ring Systems

3.14 Polycyclic Ring Systems. contain more than one ring bicyclic tricyclic tetracyclic etc. Types of Ring Systems. spirocyclic fused ring bridged ring. Spirocyclic. one atom common to two rings. Fused Ring. adjacent atoms common to two rings two rings share a common side.

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3.14 Polycyclic Ring Systems

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  1. 3.14Polycyclic Ring Systems contain more than one ring bicyclic tricyclic tetracyclic etc

  2. Types of Ring Systems spirocyclic fused ring bridged ring

  3. Spirocyclic one atom common to two rings

  4. Fused Ring adjacent atoms common to two rings two rings share a common side

  5. Bridged Ring nonadjacent atoms common to two rings

  6. Number of Rings equals minimum number of bond disconnectionsrequired to give a noncyclic species

  7. Monocyclic requires one bond disconnection

  8. Bicyclic requires two bond disconnections

  9. Bridged Bicyclic requires two bond disconnections

  10. Steroids carbon skeleton is tetracyclic

  11. 3.15Heterocyclic Compounds

  12. Heterocyclic Compound a cyclic compound that contains an atom other than carbon in the ring (such atoms are called heteroatoms) typical heteroatoms are N, O, and S

  13. Oxygen-containing Heterocycles Ethylene oxide Tetrahydrofuran Tetrahydropyran

  14. Nitrogen-containing Heterocycles Piperidine Pyrrolidine

  15. O CH2CH2CH2CH2COH Sulfur-containing Heterocycles Lipoic acid Lenthionine

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