Organic Spectroscopy Lecture 5 Notes

Cook ndsu thursday january 17 13 h3c h h oh nerol 14

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Unformatted text preview: , 13 H3C H H OH nerol 14 nOe - nuclear Overhauser effect ©2013 Gregory R. Cook, NDSU Thursday, January 17, 13 15 nOe - nuclear Overhauser effect ©2013 Gregory R. Cook, NDSU Thursday, January 17, 13 16 nOe - nuclear Overhauser effect ©2013 Gregory R. Cook, NDSU Thursday, January 17, 13 17 nOe - nuclear Overhauser effect OBn EtO2C ©2013 Gregory R. Cook, NDSU Thursday, January 17, 13 N Bn OBn OBn NaCNBH3 EtO2C stereochemistry? N Bn OBn 18 nOe - nuclear Overhauser effect ©2013 Gregory R. Cook, NDSU Thursday, January 17, 13 19 nOe - nuclear Overhauser effect ©2013 Gregory R. Cook, NDSU Thursday, January 17, 13 20 Peak Suppression - Pre-Saturation 1H @ peak freq 90° 1H ©2013 Gregory R. Cook, NDSU Thursday, January 17, 13 21 Peak Suppression - Tailored Pulse Z Z t = 1 rotation @ freq of peak to be suppressed 90° Y Y X X Z Z peak to be suppressed -90° Y peak to be suppressed X ©2013 Gregory R. Cook, NDSU Thursday, January 17, 13 Y X 22 Peak Suppression - Tailored Pulse ©2013 Gregory R. Cook, NDSU Thursday, January 17, 13 23 Peak Suppression - WEFT ‣ ‣ ©2013 Gregory R. Cook, NDSU Thursday, January 17, 13 water eliminated Fourier transform To achieve water suppression, tn is selected so that the Z magnetization of water is zero at the moment the 90° pulse is applied. During the same time Z magnetization of the molecule of interest has a chance to fully relax to equilibrium. 24 Peak Suppression - DANTE ‣ ‣ Thursday, January 17, 13 a series of small pulses and delays that add up to 90° in total. ‣ ©2013 Gregory R. Cook, NDSU Delays Alternati...
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This note was uploaded on 02/10/2014 for the course CHEM 744 taught by Professor Gregorycook during the Spring '13 term at ND State.

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