Directed reaction graphs as posets
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Reaction diagrams are considered especially for the circumstance of progressive substitution (or addition) on a fixed molecular skeleton, and it is noted that these naturally form Hasse diagrams for a partially ordered set (or poset) of the substituted structures. Ultimately several examples of such posetic reaction graphs are presented, but as a first prototypical illustration the case of progressive chlorination of the hexagonal benzene skeleton is described, and some ideas are mentioned for the utilization of the reaction diagram's posetic nature.