A substituent is an attached chemical atom or group considered relative to a chosen molecular framework. Testing whether two substituents are identical may require comparing their full chemical bond connectivity and stereochemistry.
A substituent that increases electron density in a specified molecular region through induction or chemical resonance. Donation into an arene can affect an attached metal and its other coordination ligands.
A substituent that reduces electron density in a specified molecular region by induction or chemical resonance. The sign and size of its effect depend on connectivity and the measured property.
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