Explain the following observation. Ethyl 3-phenylpropanoate (C6H5CH2CH2CO2CH2 CH3) reacts with electrophiles to afford ortho-and para-disubstituted arenes, but ethyl 3-phenyl-2-propenoate (C6H5CH = CHCO2CH2CH3) reacts with electrophiles to afford meta-disubstituted arenes.
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