IMG_0002_NEW_0006

IMG_0002_NEW_0006 - Example Predict the lH spectrum for the following molecule CHfu v,M fb'g 2 3 4 c\u 7 s;2wt5 irteb i;1r,ls v"4;Yle dr1 4

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Kevs to assigning spectra of organic molecules l. determine which protons are equivalent and which protons are inequivalent by looking for lines of symmetry or mirror planes in a molecule that relate protons. The number of inequivalent protons is equal to the number of signals in the lH NMR spectrum. for each set of equivalent protons, determine how many of them there are. The number of equivalent protons is directly related to the intensity of their lH NMR signal. based on our table of tH NMR chemical shifts (6) decide where each set of inequivalent protons should appear in the rH NMR spectrum. determine how many equivalent protons are on the carbon NEXT to the carbon that bears the proton(s) of interest. Apply the N+l rule to determine the splitting of the proton(s) of interest. If there is more than one set of equivalent
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Unformatted text preview: Example: Predict the lH spectrum for the following molecule: CHfu v,M fb'g 2. 3. 4. c\u 7 s;2wt5 irteb i;1r',ls v"4+;Yle+ dr1 4 MWs I 6 b I A g c D t t et ll+t) 7 v 11-+ l) > 7 VtD -- 7 W)>LO+t) 2.4 chemical shift protons on adjacent carbons the splitting is multiplied (e.g a dogbleLqf *'"ru;*tfJ;:lTfl* :ru "xi:ffi'r"T ;:;'F ;@@ tN*^/L'rt^ b sw'15 5. IF THERE IS ONLY ONE SET OF EQUIVALENT PROTONS on adjacent carbons look at Pascal's tnangle to determine the intensity of the group of peaks that correspond to the proton(s) ofinterest. 1,,@ ).0 V.o r5 o'8 t.K chemical shift littins ,ct+> l'r PP. tt)x ()4t) ?vl 5 oK PPrn l'.p /atQe+ J""'lAet HrlVW Lr+r)*Lftt)= 6 @+tri (ttt 1= y' c/''"W< *iri -t'r,l,t4...
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This note was uploaded on 12/27/2011 for the course CHEM 281 taught by Professor Williams during the Fall '11 term at Simon Fraser.

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