Carbon-13 nuclear magnetic resonance spectroscopy of 1-aryl-2,2-dibromocyclopropanes

Abstract

The ¹³C NMR spectra of 12 1-aryl-2,2-dibromocyclopropanes have been measured and 1-phenyl-2,2-dibromocyclopropanes was studied under different conditions of concentration, solvent, and temperature. The results suggest that the field effect is mainly responsible for the substituent chemical shift (SCS) for C-β. The ¹³C shifts for carbons on both the cyclopropyl and the phenyl rings are dependent upon concentration and solvent.