Understanding Geometric Isomerism in Chemistry
Explore the concept of geometric isomerism with a focus on cis and trans isomers in organic compounds. Learn about different types of isomerism and the significance of geometrical arrangements in chemical structures. Discover how isomers differ and their impact on compound properties. Engage in interactive learning activities to deepen your understanding of this important chemical phenomenon.
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Presentation Transcript
Chemical Ideas 3.5 Geometric Isomerism (different geometries)
Types of isomerism Isomerism Structural isomerism Stereoisomerism Geometric isomerism Optical isomerism
Build these models trans but-2-ene Cis but-2-ene
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.
cis... Different names needed to identify isomers. Substituent groups on the same side of double bond. Cis but-2-ene Cis but-2-ene
...and trans. trans means other side or cross over e.g. trans Atlantic, transplant, trans ..! Substituents on opposite sides of 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 H2 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?
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