Studies on the Nuclear Magnetic Resonance Spectra of (E)-1-Aryl-3-(2-and 3-thienyl)-2-propenones and Unique Observation of <SUP>4</SUP>J and <SUP>5</SUP>J Coupling in Their <SUP>1</SUP>H-<SUP>1</SUP>H COSY

초록

H-1 and C-13 NMR spectra of series of(E)-1-ary1-(2- and 3-thienyl)-2-propenones, that are aldol condensation products between 2- and 3-thiophenecarbaldehydes and m- and p-substituted acetophenones, were examined to make complete assignments of the chemical shifts. Long range couplings, (4)J and (5)J, are observed in the H-1-H-1 COSY of both 2- and 3-thienyl compounds, which makes the elucidation of the conformation in solution possible. In contrast, the 2-furyl analogue shows the long range coupling phenomena, but the 3-furyl and phenyl analogues do not show similar phenomena.

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