Hughes–Ingold symbol

Not to be confused with Hughes–Ingold rules.

A Hughes–Ingold symbol describes various details of the reaction mechanism and overall result of a chemical reaction.[1] For example, an SN2 reaction is a substitution reaction ("S") by a nucleophilic process ("N") that is bimolecular ("2" molecular entities involved) in its rate-determining step. By contrast, an E2 reaction is an elimination reaction, an SE2 reaction involves electrophilic substitution, and an SN1 reaction is unimolecular. The system is named for British chemists Edward D. Hughes and Christopher Kelk Ingold.

References

  1. ^ Gawley, Robert E. (1999-06-04). "A proposal for (slight) modification of the Hughes–Ingold mechanistic descriptors for substitution reactions". Tetrahedron Letters. 40 (23): 4297–4300. doi:10.1016/S0040-4039(99)00780-7. ISSN 0040-4039.


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