Abstract
Abstract Improved carbon—hydrogen coupling constants together with standard errors are given for furan and thiophene via an iterative spectral fitting procedure from undecoupled 20 MHz carbon NMR spectra. Carbon chemical shifts and carbon—hydrogen coupling constants for the carbonyl compounds are presented and discussed. It is concluded that long range carbon—hydrogen couplings in these systems are not as valuable for conformational assignments as the analogous proton—proton interactions.
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