UH CHEM 3331 - C NMR. class conclusion (2 pages)

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C NMR. class conclusion



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C NMR. class conclusion

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Lecture number:
28
Pages:
2
Type:
Lecture Note
School:
University of Houston
Course:
Chem 3331 - Organic Chemistry
Edition:
1
Documents in this Packet

Unformatted text preview:

CHEM 3331 1nd Edition Lecture 28 Outline of Last Lecture I NMR Spectroscopy II Number of different peaks III Position of peaks IV Peak area V Peak splitting Outline of Current Lecture I NMR C13 Current Lecture I NMR C13 C12 is NMR inactive and accounts for 98 9 of a carbon molecule C13 is NMR active and accounts for 1 1 of a carbon molecule C14 is NMR inactive and is only in trace amounts since it is radioactive There is a 100 fold lower sensitivity then in proton NMR Takes over an hour to get results C 1 4 H sensitivity is 400 times lower in C NMR C13 will feel electronic disturbances easier The range for C NMR is 0 250 ppm Alkanes 0 40 C O 55 90 C C 100 150 C O 160 210 C C 75 100 Spectra are recorded in D2O CDCl3 and CD2Cl2 H is replaced with deuterium so we don t get peaks from H in the solvent CDCl3 is the most common and is indicated by three lines around 77ppm with a 1 1 1 ratio Peak areas mean nothing in C NMR These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Peak splitting H H common splitting suppressed with continuous irradiation Therefore peaks are singlets C H 100x less common splitting intentionally C C 10000x less common negligible



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