title: Application of HSQC in the delineation of NMR signals of E and Z isomers of octadecyl p-coumarates.
abstract: Octadecyl p-coumarates undergo E-Z isomerization in daylight. Although (1) H NMR, (13) C NMR and (1) H-(1) H COSY gave indications about this isomerization, the overlapping of some signals in the (1) H NMR of aromatic region prevented the delineation of signals of the individual isomers. However, heteronuclear spin quantum coupling correlation (HSQC) with the unique feature of two sets of nearby δ(C) -δ(H) correlations gave conclusive evidence for this isomerization and helped in the delineation of (1) H NMR and (13) C NMR signals of E-octadecyl p-coumarate and Z-octadecyl p-coumarate.
authors.affiliation: Indian Institute of Horticultural Research, Hessaraghatta Lake PO, Bangalore, 560089, India. nidiry@yahoo.co.in
authors.forename: Eugene Sebastian J
authors.initials: ES
authors.lastname: Nidiry
mesh_terms: D003373:Coumaric Acids / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000592:standards; D015394:Molecular Structure; D012015:Reference Standards; D013237:Stereoisomerism
chemical_list: D003373:Coumaric Acids