¹⁷O NMR investigation of acetyl and formylthiophenes, furans and pyrroles

Abstract

Abstract The 17 O nmr chemical shifts of 20 acetyl and formylthoiphenes, furans, and pyrroles are reported. The chemical shifts qualitatively correlate with the electronic character of the heterocyclic rings. The effect of steric factors are noted for the 17 O chemical shifts of alkyl substituted acetylthiophenes and for N ‐methylpyr‐roles.