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

Bulletin of the Korean chemical society

Chang Kiu Lee¹  In Sook Han Lee¹  Hyun Ju Jeon¹ 

关键词: 1H and 13C NMR;    Thiophene;    Furan;    Enone;    Conformation in solution;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

1H and 13C NMR spectra of series of (E)-1-aryl-(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, 4J and 5J, are observed in the 1H-1H 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.

【 授权许可】

Unknown