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Carbon‐13 NMR spectra of dispiro compounds: Effect of homologation on chemical shifts of spiro carbons
Author(s) -
Seth Neelima M.,
Bhaduri A. P.
Publication year - 1985
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260230220
Subject(s) - chemistry , alkoxy group , chemical shift , carbon 13 nmr , nmr spectra database , carbon fibers , organic chemistry , medicinal chemistry , ene reaction , spectral line , stereochemistry , alkyl , physics , materials science , astronomy , composite number , composite material
Abstract A comparative study of the 13 C NMR spectra of derivatives of 14‐alkoxy‐ and 14‐hydroxy‐14‐azadispiro[5.1.5.2]pentadec‐9‐ene‐7,15‐diones and 12‐alkoxy‐and 12‐hydroxy‐12‐azadispiro[4.1.4.2]tridec‐8‐ene‐6,13‐diones has been carried out to establish the effect of homologation on the chemical shift of the twospiro carbons in the former class of compounds. Of the two spiro carbons of the derivatives of 14‐alkoxy‐14‐azadispiro[5.1.5.2]pentadec ‐ 9 ‐ ene ‐ 7, 15 ‐diones C‐8 was found to have experienced a greater shielding effect on homologation than the spiro carbon C‐6.