SEARCH Articles Figures Tables A-Substituent effects And substituent effects And substituents effects Effect of Polarity Effect of Substituents and Polarity Effect of ring substituents Effect of substituent Effects of Rings Effects of substituents Heteroatom Substituents Heteroatom substituent Heteroatomic Rings Heteroatomic substituents Polar effect Polar substituent Polar substituent effects Polar substituents Polarity, effect Polarization effects Ring effect Ring substituents The Effects of Heteroatoms