PREPARATION AND SPECTROSCOPIC ANALYSIS OF 1-ARYL-2-BROMOCYCLOPROPANES

1-Aryl-2-bromocyclopropanes have been prepared in good yields by reduc tion of 1-aryl-2,2-dibromocyclopropanes with diethyl phosphite and tri ethylamine: IR analysis indicates characteristic stretching lines at c a. 1260 and 555+/-15 cm(-1) for the cis isomers and of 1230 and 630+/- 20 cm(-1) for the trans-isomers; substituent chemical shifts, determin ed from the C-13 NMR spectra, demonstrate the predominance of field an d resonance effects for the cis- and trans-isomers, respectively.