Chem 3al lecture for NMR #3 - Complex Coupling singlet...

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Complex Coupling singlet triplet doublet quartet ?
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6ppm 5ppm 4ppm 3ppm 2ppm 1ppm 0 ppm TMS Cl H A Cl Cl H B H B Cl H A Cl Br H B C Successive Application of the N + 1 Rule H A J CA J BA J BA What if: J AB = 3 Hz J AC = 8 Hz J BC = 6 Hz 6ppm 5ppm 4ppm 3ppm 2ppm 1ppm 0 ppm TMS J AC J AB J CB J BC J BC H B H C J AB doublet of doublets (dd) doublet of doublets (dd) doublet of doublets (dd) Two different hydrogen atoms coupling to a third hydrogen atom
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Successive Application of the N + 1 Rule What if: J AB = 6 Hz J AC = 6 Hz J BC = 8 Hz Cl H A Cl Br H B C doublet of doublets (dd) H A J BA J CA J CA J BC J AC J AC H C J CB J AB J AB H B doublet of doublets (dd) doublet of doublets (dd) 6ppm 5ppm 4ppm 3ppm 2ppm 1ppm 0 ppm TMS Two different hydrogen atoms coupling to a third hydrogen atom C C H B H B C H A R H A H C H C H C J AB J CB a triplet of quartets will be observed AB = J CB a sextet will be observed
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C CH 3 H B H B C H A R R (C) Successive Application of the N + 1 Rule Doublet of Quartets (dq) J AB J CB J CB J AB J CB J CB
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C C H B H C C H A R R R" R' H D R' R" J CB J AB J AB J DB J DB H B J AB J CB J DB J CB > J AB > J DB J CB J AB J AB J DB J DB H B J CB J AB J AB = J DB J CB > J AB doublet of doublet of doublets (ddd) doublet of doublet of doublets (ddd) Successive Application of the N + 1 Rule
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Chem 3al lecture for NMR #3 - Complex Coupling singlet...

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