Do the solvolysis reactions of secondary substrates occur by the S N 1 or S N 2 mechanism: or something else? [Book Review]
David Bourget (Western Ontario)
David Chalmers (ANU, NYU)
Rafael De Clercq
Jack Alan Reynolds
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Foundations of Chemistry 13 (2):131-143 (2011)
Primary and methyl aliphatic halides and tosylates undergo substitution reactions with nucleophiles in one step by the classic S N 2 mechanism, which is characterized by second-order kinetics and inversion of configuration at the reaction center. Tertiary aliphatic halides and tosylates undergo substitution reactions with nucleophiles in two (or more) steps by the classic S N 1 mechanism, which is characterized by first-order kinetics and incomplete inversion of configuration at the reaction center due to the presence of ion pairs. When the nucleophile is also the solvent, the substitution reaction is called a solvolysis, and both the S N 2 and S N 1 reactions now obey first-order kinetics. Schleyer and Bentley have provided solid, but not conclusive, evidence that secondary substrates undergo solvolysis by a merged mechanism, one that blends characteristics of both the S N 2 and S N 1 mechanisms. The following paper presents the history of their sustained pursuit of a merged mechanism and subsequent rebuttals to this claim. Several issues related to the philosophy and sociology of science are also discussed
|Keywords||Solvolysis reaction Two-step mechanism One-step mechanism Ion pairing Merged mechanism Solvent ionizing power Solvent nucleophilicity Kinetics α secondary isotope effects Secondary substrates Nucleophilic solvent assistance|
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References found in this work BETA
J. M. Ziman (1987). The Problem of “Problem Choice”. Minerva 25 (1-2):92-106.
Roald Hoffmann, Vladimir I. Minkin & Barry K. Carpenter (1997). Ockham's Razor and Chemistry. Hyle 3 (1):3 - 28.
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