Pre-lecture Reading Assignment: Equivalent Protons and Integration

Quick Intro

Some hydrogen atoms (or protons) in a structure are the same, while others are different. Knowing when protons are equivalent in a structure will help us to decipher the clues we obtain from a ¹H NMR spectrum. In calculus you learned that integration is the area under a curve. The same is true in spectroscopy! The area under the curve, or integration, in a ¹H NMR spectrum tells us the relative numbers of hydrogen atoms that correspond to each signal.

 

Objectives

• Recognize chemically equivalent protons in a structure.
• Explain what information integration values provide.
• Determine integration values from integral trails when values are not directly provided.

 

Associated Reading

• Smith 3rd ed: Ch 14.2, 14.5
• Smith 4th ed: Ch 14.2, 14.5
• Smith 5th ed: Ch 14.2, 14.5
• Smith 6th ed: Spectroscopy C.2, C.5

 

Your Tasks

Before Class

• Complete assigned reading.
• Get the worksheet for the lecture.

After Class

• Work on more problems.
• Go to a discussion section and/or office hours.
• Review any areas that you struggled with on in-class activities.