Abstract

MECHEM is a computer aid for elucidation of reaction pathways, developed over the last five years. The program searches systematically and comprehensively for the simplest multi-step reaction pathways (or mechanisms) that are consistent with the experimental constraints formulated by the experimentalist, any ad-hoc assumptions, and its internal theory. Previous articles have reported the basic pathway-generation algorithm and another algorithm that tests the structural soundness of individual steps. This article introduces an algorithm to solve another basic problem: given a multi-step pathway containing a mixture of molecular structures and formulas, assign possible structures to the formulas while obeying (and exploiting) the constraint imposed by the pathway steps. With this new algorithm, MECHEM is now approaching competence as an interactive tool for elucidating some catalytic reaction pathways, which is the current chemical focus.

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