One example is found in so-called "'Anion Relay Chemistry "'in which a negative charge of an anionic functional group resulting from one organic reaction is transferred to a different location within the same carbon framework and available for secondary reaction.
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If the reaction is not terminated, but instead the radical group ( s ) go on to react further, the steps where new radicals are formed and then react is collectively known as "'propagation "'( "'4 "', "'5 "') because a new radical is created available for secondary reactions.
