Nmr spltting pattern

Tree diagram and splitting of various protons

1. Splitting Diagrams / Complex Splitting / Tree diagram of splitting in NMR Shaikh Siraj Babula l Abeda Inamdar Senior College, Pune-01

2. Q1) Find line splitting pattern (tree Diagram) for a given signal ( H b ) at =6 ppm on 400 MHz machine frequency (if J ab = 16Hz, J ac = 12Hz, J bc = 2 Hz) Splitting pattern for Hb proton: From above data: Hb Proton shows dd (J= 16 & 2Hz) In splitting -Large coupling constant split first then smaller 16Hz 2Hz Hb = 6 δ 2Hz d d 2 AISC/SBS/MSC spectroscopy Actual peak look like

3. Line value in splitting of signal 16Hz 2Hz Hb = 2400Hz 2Hz 2391Hz 2392 3 Hz value of proton as δ =6 ppm by using formula 6 ppm = 6 x 400 = 2400 Hz 2408 2393Hz 2407 Hz 2409Hz 5.9775 5.9825 6.0175 6.0225 δ

4. Q2) Find line splitting pattern (tree Diagram) for a given H a. Proton if J ab = 16Hz, J ac = 12Hz, J bc = 2 Hz Splitting pattern for Ha proton: From above data: Ha Proton shows dd (J= 16 & 12Hz) 16Hz 12Hz Hc 12Hz d d 4

5. Splitting pattern in Vinyl Acetate 5 AISC/SBS/MSC spectroscopy

6. Q3) Find line splitting pattern (tree Diagram) for a given H b . Proton if J (a-b) = 12Hz, J (b-CH3) = 06 Hz 6 Splitting pattern for Hb proton: From above data: Hb Proton shows dq (J= 12 & 6Hz) 12Hz 6Hz Hb 6Hz q d 6 6Hz 6Hz 6Hz 6Hz Crossing / Merge peak also observed

7. Q4) Find line splitting pattern and value of each line in Hz for a given H b . Proton if J (a-b) = 12Hz, J (b-CH3) = 06 Hz 7 AISC/SBS/MSC spectroscopy

8. Splitting in Aromatic Compounds AISC/SBS/MSC spectroscopy 8 Find splitting of Ha proton, line value if it at δ = 7 ppm and RF= 300 MHz 8Hz 8Hz Hb 8Hz d d Merge dd become ‘t’ because only three line 2100 Hz 2104 Hz 2108 Hz 2100 Hz 2100 Hz 2092 Hz 2096 Hz

9. Splitting in Aromatic Compounds AISC/SBS/MSC spectroscopy 9 Find splitting of Ha proton if it at 7 ppm On 300 MHz instrument 2Hz 2Hz Hb 2Hz d d Merge dd become ‘t’ becouse only three line

10. Splitting pattern for Aromatic protons Find splitting for Ha, Hb , Hc and Hd protons with tree diagram. AISC/SBS/MSC spectroscopy 10 Take Ha as ddd at 8,8,2 Hz Hb as dd at 8,2 Hz Hc as ddd at 8,8,2 Hz Hd as dd at 8,2 Hz

11. Splitting pattern for Aromatic protons Find splitting for Hb protons with tree diagram. AISC/SBS/MSC spectroscopy 11

12. Splitting pattern of proton if different coupling constant. 12 AISC/SBS/MSC spectroscopy

13. Splitting pattern of protons depend on coupling constant. 13 AISC/SBS/MSC spectroscopy

14. Home Work Questions Q1) Find line splitting pattern (tree Diagram) and line value for a given H b Proton. if J (a-b) = 16Hz, J (b-CH2) = 06 Hz 14 AISC/SBS/MSC spectroscopy

15. Q 2) the 'H NMR of the alkene part of the Claisen rearrangement product. What are the coupling patterns (singlet, doublet, etc) for Ha, Hb , and Hc ? As terminal vinyl hydrogens, Hb and Hc have very similar chemical shifts. How would you differentiate Hb from Hc ? Draw splitting pattern for 'H NMR signals of Hb and Hc . 15 AISC/SBS/MSC spectroscopy

16. Thank You 16 AISC/SBS/MSC spectroscopy