multiplet handout.png - What is a'multiplet[m 1 n 1 rule...

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Unformatted text preview: What is a 'multiplet [m]'? 1. n+1 rule applies, but there are many neighbors Another example: d 9 Coursepack: J< ' p. 76 spectrum H 1 (m1) n t— ult' | t m’1 ( one — m Ip e ) M l | l 3 2 1 0 PPM 2. n+1 rule not enough; non-equivalent neighbors* 6.07 H [coursepack Another example: 5.31 Coursepack:t O\/J§J'I p. 76 spectrum 1 H 4.04 4.04 H 1 (m4) and mi d’1 5.43 5.43 spectrum 2 (m1; m2) l l I I 6 4 2 0 PPM This proton has 3 different types of neighbors. The n+1 rule cannot apply. *note: multiple peak splitting due to coupling of non-equivalent neighbors is a multiplet. If we can distinguish the peaks we expect, then we label them, for example the doublets of doublets above. If we could not distinguish the dd, then that would be called a multiplet too. 3. Different NMR signals are too close to distinguish; overlapping peaks Another example: Coursepack: p. 82: that pair 01‘ng is ’ . '7' ,, difficult to “ distinguish, and could be labeled EA p. 87C: the m,2 is two WWW multiplets (1 for each | ‘. , I diasteriotopic H) but 3 2 1 0 we cannot tell which , PPM is which, so we call it The green hydrogen signals are separate (2 different 1 multiplet for 2 H environments) but the signals are so close in chemical shift that the multiplets overlap. We group them together and call it a multiplet for 3 proton signals. ...
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