NMR chemical shift prediction of thiophenes

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The chemical shifts of thiophenes can be estimated using substituent chemical shifts (SCS) for the substituents in α (2/5) and β (3/4) positions.
The SCS values used for the calculations are taken from [1].

Literature

[1] "Parameter set for the prediction of the 13C-NMR chemical shifts of sp2- and sp-hybridized carbon atoms in organic compounds"
Pretsch E, Fürst A, Robien W Anal. Chim. Acta 248 (1991) 415-428
picture of thiophene

R2=
R3=
R4=
R5=

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