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Nmr spltting pattern
- 1. Splitting Diagrams / Complex Splitting / Tree diagram of splitting in NMR Shaikh Siraj Babulal Abeda Inamdar Senior College, Pune- 01
- 2. Q1) Find line splitting pattern (tree Diagram) for a given signal (Hb) at =6 ppm on 400 MHz machine frequency (if Jab = 16Hz, Jac = 12Hz, Jbc = 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 2AISC/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 2393Hz2407 Hz2409Hz 5.97755.98256.01756.0225δ
- 4. Q2) Find line splitting pattern (tree Diagram) for a given Ha. Proton if Jab = 16Hz, Jac = 12Hz, Jbc = 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 5AISC/SBS/MSC spectroscopy
- 6. Q3) Find line splitting pattern (tree Diagram) for a given Hb. Proton if J(a-b) = 12Hz, J(b-CH3)= 06 Hz 6 Hb CH3Ar Ha Splitting pattern for Hb proton: From above data: Hb Proton shows dq (J= 12 & 6Hz) 12Hz 6Hz Hb 6Hz q d 6 6Hz6Hz 6Hz6Hz Crossing / Merge peak also observed
- 7. Q4) Find line splitting pattern and value of each line in Hz for a given Hb. Proton if J(a-b) = 12Hz, J(b-CH3)= 06 Hz 7AISC/SBS/MSC spectroscopy CH3 HbAr Ha
- 8. Splitting in Aromatic Compounds AISC/SBS/MSC spectroscopy 8 Ha Hc Hb R2 R1 R3 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 R Hc Hb Ha R1 R2 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 Ha Hc Hb R1 R2Hd 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 Hb R3 Ha R1 R2Hc
- 12. Splitting pattern of proton if different coupling constant. 12AISC/SBS/MSC spectroscopy
- 13. Splitting pattern of protons depend on coupling constant. 13AISC/SBS/MSC spectroscopy
- 14. Home Work Questions • Q1) Find line splitting pattern (tree Diagram) and line value for a given Hb Proton. if J(a-b) = 16Hz, J(b-CH2)= 06 Hz 14AISC/SBS/MSC spectroscopy HbAr Ha Cl
- 15. Q 2) the 'H NMR of the alkene part of the Claisen rearrangement product. 1) What are the coupling patterns (singlet, doublet, etc) for Ha, Hb, and Hc? 2) As terminal vinyl hydrogens, Hb and Hc have very similar chemical shifts. How would you differentiate Hb from Hc? 3) Draw splitting pattern for 'H NMR signals of Hb and Hc. 15AISC/SBS/MSC spectroscopy