Electron withdrawal or donation through σ bonds.
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4,4-Dimethyl-5-oxo-2-phenethyl-tetrahydro-furan-3-carboxylic acid ethyl ester
2-BROMO-3-CHLORO-1-PROPENE
2-Propenoic acid, 3-[3-(chloromethyl)phenyl]-, methyl ester
[2,2,2-Trifluoro-1-(trifluoromethyl)ethyl]benzene
