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Geometric Isomerism

Geometric Isomerism - double bond trans but-2-ene Different...

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Chemical Ideas 3.5 Geometric Isomerism (different geometries)
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Types of isomerism Isomerism Structural  isomerism Stereoisomerism Geometric  isomerism Optical  isomerism
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Build these models Cis but-2-ene trans but-2-ene
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Two isomers are not interchangeable. • Carbon 2 & 3 joined by double bond. • No free rotation. • Bonds would have to be broken and reformed. • +270 kJ mol -1 energy needed to break this bond. • Insufficient energy available at room temperature.
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cis... • Different names needed to identify isomers. • Substituent groups on the same side of double bond. • Cis but-2-ene Cis but-2-ene
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...and trans . • “ trans ” means other side or cross over e.g. trans Atlantic, transplant, trans…..! • Substituents on opposite sides of
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Unformatted text preview: double bond. trans but-2-ene Different compounds- different properties. Time to think and apply what we have learned! • How are the structures of nerol and geraniol related? • How many moles of H 2 would be needed to saturate one mole of geraniol? • How are nerol and geraniol related to citronellol? • How are the structures of nerol and geraniol related to linalool? This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching....
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