CHAPTER 9 OBJECTIVES - 1 H NMR spectra using(n 1 formula...

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CHEM 2370 OBJECTIVES CHAPTER 9 NUCLEAR MAGNETIC RESONANCE TERMS: Know definitions, give examples, explain briefly 1. Chemical Shift 2. Integration 3. Deuterated solvents 4. Signal splitting 5. Shielding / deshielding of protons 6. Upfield / downfield 7. TMS: tetramethylsilane 8. Equivalent, non-equivalent protons (with respect to chemical shift) 9. Homotopic, Enantiotopic, Diastereotopic hydrogens 10. Spin-spin coupling 11. Coupling constant 12. Off-resonance coupling 13. DEPT 13 C spectrum KNOW HOW TO : 1. Predict and correlate: a) a) Shielding / deshielding effects in 1 H and 13 C NMR spectra (based on resonance and inductive effects) : effect on position of signal b) b) Structural formula with homotopic, enantiotopic, diastereotopic hydrogens c) c) The number of signals in the 1 H NMR spectrum with the different kinds of protons (equivalent, non-equivalent) present in the molecule d) d) Integration data with the number of equivalent hydrogen atoms producing each signal e) e) Simple splitting patterns in
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Unformatted text preview: 1 H NMR spectra using (n+ 1 ) formula, where n = number of equivalent protons on neighboring carbons f) f) Complex splitting patterns using {( n +1)*( n’ +1)*( n”+ 1)….} formula, where n, n’, n”… = non-equivalent protons on neighboring carbons: (actual peaks observed may be fewer than theoretically calculated number) g) g) The number of signals in the 13 C NMR spectrum with the different kinds of carbons (equivalent, non-equivalent) present in the molecule h) h) Short peak height in 13 C NMR: frequently associated with 4 ° carbon or other carbons not bearing any hydrogens 2. Explain why TMS is an excellent reference compound for NMR spectroscopy. 3. Explain why NMR samples must be prepared in deuterated solvents 4. Use DEPT 13 C spectrum to determine the methyl (-CH 3 ), methylene (-CH 2-) and methane (>CH-) groups on the molecule 5. Interpret combined IR and NMR data to determine structures of unknown substances....
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This note was uploaded on 04/14/2008 for the course CHEM 2370 taught by Professor Dandekar during the Fall '07 term at North Texas.

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