New Concepts—New Systems

  • Herbert C. Brown

Abstract

The extraordinary difficulties that we and others have encountered in obtaining unambiguous evidence for the long postulated σ-participation in exo-norbornyl derivatives with accompanying charge delocalization from the 2- to the 1- and 6-positions1 have been reviewed in this book. These difficulties have led to new proposals for an alternative stereoelectronic effect to favor the ionization of the exo isomer, but without the σ-bridge of the original proposal. These new proposals will now be considered. In addition, new systems have been advanced as providing less ambiguous examples for σ-bridging. Some of these will be briefly considered here.

Keywords

Deuterium Isopropyl Dichloride Ethylene Dichloride Hexyl 

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Copyright information

© Plenum Press, New York 1977

Authors and Affiliations

  • Herbert C. Brown
    • 1
  1. 1.Purdue UniversityWest LafayatteUSA

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