Orbital Correspondence Analysis Maximum Symmetry

E. A. Halevi, Orbital Correspondence Analysis in Maximum Symmetry. Helv. Chim. Acta 1975, 58, 2136-2151. 

An analysis of the dimerization of silacyclopropene was carried out by Orbital Correspondence Analysis in Maximum Symmetry (OCAMS). This analysis showed that the dimerization of silacyclopropene follows an allowed pathway <82JOM(240)129>. 

Huisgen s mechanism was also discussed on the basis of the principle of orbital correspondence analysis in maximum symmetry (OCAMS) by Halevi (1992, p. 168). 

OCAMS orbital correspondence analysis in maximum symmetry... 

In their now classic monograph [1], Wooodward and Hoffmann concentrate on three basic types of no mechanism reaction Electrocyclic reactions -notably polyene cyclizations, cycloadditions, and sigmatropic rearrangements. These three reaction types will be taken up in this and the next two chapters from the viewpoint of Orbital Correspondence Analysis in Maximum Symmetry (OCAMS) [2, 3, 4], the formalism of which follows naturally from that developed in Chapter 4. The similarities to the original WH-LHA approach [5, 6], and the points at which OCAMS departs from it, will be illustrated. In addition, a few related concepts, such as allowedness and forbiddenness , global vs. local symmetry, and concertedness and synchronicity , will be taken up where appropriate. 

Professor Halevi has set out to correct the situation by making available a rigorously written text. He relies on a particularly well thought-through formulation, referred to as Orbital Correspondence Analysis in Maximum Symmetry (OCAMS). The playful reference to the medieval scholar, Occam, whose fabled razor all students are told about, is well chosen this is a text of high intellectual and scholarly standards. 

My object in writing this book is to present a coherent set of operational rules for the analysis of reaction mechanism in terms of symmetry, and to explore their scope and reliability. It is written from the viewpoint of Orbital Correspondence Analysis in Maximum Symmetry - OCAMS for short, hence its subtitle, but not with the intention of touting a homemade prodct The procedural details of OCAMS are of secondary importance its advantage lies in the provision of a coherent overview of the relation between symmetry and mechanism it allows us to see the forest without losing sight of the trees. For reasons of self-consistency, the book remains within the framework of molecular orbital theory reformulation of the OCAMS approach in valence-bond terms has not been attempted. 

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