¹³C-NMRStudies on Halomethylvinyl Chrysanthemic Acids and Esters-Spin-lattice Relaxation Time and ¹³C-¹H Coupling Constants

Abstract

New types of stable chrysanthemic acids and esters were synthesized, and their ¹³C-NMR were examined and fully analyzed. The configurations of the cyclopropanecarboxylic acid and halomethylvinyl group were reflected on the spin-lattice relaxation time of the substituted methyl carbon involved in their structure. The long-range spin-spin coupling constants (³J_Ch) correlated
well to the NOE and T₁ measurements, which can generally be used to distinguish the geometry of the substituted double bond.