Carbon 13 nmr

Question 1

What information (2) can be found by carbon 13 nmr?

Answer 1

1. The number of peaks tells us the different number of carbon environments
2. The types of environments by the chemical shift.

Question 2

What is TMS and what is it used for?

Answer 2

Tetramethylsilane, is used as the standard for chemical shifts measurements, it produces a ppm of 0. This is then used to refer chemical shifts against.

Question 3

Name a deuterated solvent and its use

Answer 3

CDCl3, deuterated solvents usually produce no signal for carbon 13 or proton nmr, so that the chemical shifts can be read clearly.
CDCl3 actually produces a signal for carbon 13 nmr but it is usually filtered out by a computer.