Why was it that Roald Hoffmann was the perfect collaborator for R. B. Woodward for proposing the Principle of Conservation of Orbital Symmetry as the solution to the no-mechanism puzzle? This publication presents 17 "tools" that Hoffmann used extensively and effectively prior to the Woodward-Hoffmann collaboration that would he call upon reveal the mechanism of pericyclic reactions. In a sense, this is a biography of Hoffmann with a focus on his personal and professional skills as of May 5, 1964.
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