H 2 h 2 c c special groups h 2 c h 2 c ch c h

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H 2 H 2 C C Special Groups: H 2 C H 2 C CH C H methylene vinyl allyl 2-ethyl-1-pentene 2-methyl-3-hexene 2-methyl-1,3-butadiene 1-methylcyclohexene 1,4-cylcohexadiene 1,5-dimethylcyclopentene
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Cis-Trans Cis-Trans Isomerization Isomerization in Life± in Life O light H o H 11- cis -retinal All- trans -retinal (electrical signal to brain) This isomerization is the initial OH event in visual excitation! Vitamin A b -carotene
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R R H H H R H R > trans cis Substitution: tri- di- mono- R R R R R R R H H R R H H R H H H R H R > > > ~ ~ H H H H > tetra- Alkene Stability more stable more stable less stable less stable E-Z Nomenclature± higher higher lower lower Z (zusammen) higher lower Cahn-Ingold-Prelog Rules for Assigning Priority 1. Look at atoms directly attached to the double bond. Higher atomic number = higher priority 2. If no difference exists at the first attached atom, keep going down the line until the first difference is reached. 3. Multiple bonded atoms are equivalent to the same number of single- bonded atoms C O H C O O H C O O H CH 3 higher lower vs. lower higher E (entgegen)
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  • Spring '05
  • NoProfessor
  • Atom, Isomers, Chemical bond, hydrogen atoms, double bond, unsaturation

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