1 / 4

Chapter 3 CONFORMATIONS OF ALKANES AND CYCLOALKANES

Chapter 3 CONFORMATIONS OF ALKANES AND CYCLOALKANES. Chapter 3: Conformations of Alkanes and Cycloalkanes. HEATS OF COMBUSTION AND RING STRAIN. Chapter 3: Conformations of Alkanes and Cycloalkanes. STRAIN ENERGY VS. RING SIZE. Chapter 3: Conformations of Alkanes and Cycloalkanes.

elinor
Download Presentation

Chapter 3 CONFORMATIONS OF ALKANES AND CYCLOALKANES

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Chapter 3CONFORMATIONS OF ALKANES AND CYCLOALKANES Chapter 3: Conformations of Alkanes and Cycloalkanes

  2. HEATS OF COMBUSTION AND RING STRAIN Chapter 3: Conformations of Alkanes and Cycloalkanes

  3. STRAIN ENERGY VS. RING SIZE Chapter 3: Conformations of Alkanes and Cycloalkanes

  4. TYPES OF STRAIN IN ORGANIC MOLECULES (SUMMARY) • Torsional Strain: The strain due to eclipsing of bonds at neighboring carbon atoms. Energy cost – about 1 kcal/mol for C-H --- C-H eclipse, or 1.3 kcal/mol for C-H --- C-CH3 eclipse. • Steric Hindrance: The strain due to repulsive interactions, when atoms or groups approach each other too closely. Energy cost – about 0.8 kcal/mol for C-CH3 --- C-CH3 gauche interaction. • NOTE: The C-CH3 --- C-CH3 eclipsed interaction is a cumulative torsionalstrain + sterichindrance!!! • Angle Strain: The strain due to expansion or compression of bond angles. Energy cost – varies, depending on the actual bond angle. Chapter 3: Conformations of Alkanes and Cycloalkanes

More Related