Noun
Any atom, group, or radical substituted for another, or entering a molecule in place of some other part which is removed.
Source: Webster's dictionaryA key step in the catalytic cycle is a transmetalation in which a zinc halide exchanges its organic substituent for another halogen with the palladium (nickel) metal center. Source: Internet
Aromatic substitution In aromatic substitution one substituent on the arene ring, usually hydrogen, is replaced by another substituent. Source: Internet
For each of the two atoms in the double bond, it is necessary to determine the priority of each substituent. Source: Internet
The electron-withdrawing effect of the substituent makes ionisation easier, so successive pK a values decrease in the series 4.7, 2.8, 1.4 and 0.7 when 0, 1, 2 or 3 chlorine atoms are present. Source: Internet
Naming substituted hex-1-enes Cis–trans notation main In the specific case of disubstituted alkenes where the two carbons have one substituent each, cis–trans notation may be used. Source: Internet
A valeric acid substituent is attached to one of the carbon atoms of the tetrahydrothiophene ring. Source: Internet