Topic 24: 13C NMR

24.1In what four ways is 13C NMR significantly different from 1H NMR?
 
24.2Why is 13C-13C splitting not observed? [Hint: What is the natural abundance of carbon-13?]
 
24.3Can 1H-13C splitting be observed on a standard 13C NMR spectrum?
 
24.4Can 1H-13C splitting be observed on a standard 1H NMR spectrum? (Look carefully at an NMR spectrum you may have taken. What would you be looking for?)
 
24.5How could you distinguish between a carboxylic acid and an aldehyde using 13C NMR? Using 1H NMR?
 
24.6Why don‘t we integrate 13C NMR spectra? [Hint: Find out what relaxation time is in NMR spectroscopy.]
 
24.713C NMR spectra often have three tall lines, all equal height, at ? 77 ppm. What are they from? Why three equal-height lines?
 
7 questions
364 questions for Organic I

364 Questions for Organic I

Dearest Student. This web page is a set of questions I call Detailed Intended Learning Outcomes For Organic Chemistry (Part I). Some time ago I asked myself, "Bob, what do you think are the key questions that you hope students will be able to answer after taking Chemistry 247 at St. Olaf College?" So here you have them. Some are very simple; some require more thought. All are good questions to be thinking about as you read, discuss, and master the practical aspects of organic chemistry. They are discussion starters and review tips. There are no answers here (though there are some clues). The questions are here to help you focus on what's important (to me, at least!) and organize your learning process. The questions are grouped into topics. Bite-size chunks. Take them a few at a time. Don't feast on them all at one sitting!

(preliminary version 2021.01.15 feeback: Bob Hanson)