A Few Things From the Organic Unit, Followed up - PowerPoint PPT Presentation

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A Few Things From the Organic Unit, Followed up

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  1. A Few Things From the Organic Unit, Followed up

  2. Geometric Isomers in Organic Molecules • The only type of geometric isomer “type” we will discuss is cis-trans isomerism • With TM complexes, we had cis-trans isomerism in square planar and octahedral complexes • Ligands were either 90° (cis) or 180° (trans) apart from one another • Cis = “same side”; trans = “across from one another” • In organic molecules, cis-trans isomers can occur in certain alkenes • Alkene  a double bond is necessary (but not sufficient

  3. Example of a cis-trans isomer pair Trans = “opposite sides of double bond” (across the double bond) Cis = “same side of double bond”

  4. These two compounds are only different because rotation about a db is restricted—a p bond would need to break

  5. When is cis-trans isomerism possible? D A C C B E • Consider the following “generalized” alkene with substituents • To have cis-trans isomers, bothof the following must be true: • A  B AND • D  E