The proton magnetic resonance of fifteen cyclopropane derivatives were studied In each case the substituent groups were on only one of the ring carbons The chemical shifts of the four protons on the remaining two carbons were determined to range from δ values of 0 40 to 1.62 ppm, using as an internal reference tetramethyl silane (with δ = 0 00). Direct evidence on the relative electron withdrawing ability of the substituent groups is presented
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