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Unformatted text preview: dimensionless units termed "parts per million" (ppm) from some reference compound. What is the relationship between a chemical shift scale in Hz. and a scale in "ppm”? 5. NMR : Due to elements of symmetry within the structure of the molecule, the 13 C NMR spectrum of ethane contains only a single resonance, the corresponding spectra of (CH 3 ) 2 CHBr and (CH 3 ) 3 CBr would contain 2 resonances. How many distinct resonances are there in : i) The 1 H NMR spectrum of (CH 3 ) 4 C? ii) The 13 C NMR spectrum of (CH 3 ) 4 C? iii) The 31 P NMR spectrum of (CH 3 CH 2 ) 3 PO? iv) The 13 C NMR spectrum of (CH 3 CH 2 ) 3 PO? v) The 1 H NMR spectrum of (CH 3 CH 2 ) 3 PO? 6. NMR The 1 H and 31 P NMR spectra of trimethyl phosphate, (CH 3 O) 3 PO, are given below. Rationalize the appearance of both spectra....
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- Spring '09
- Nuclear magnetic resonance, Proton NMR, NMR spectrum, Carbon-13 NMR