By 0. EISENSTEIN, J.-M. LEFOUR, and NGUYEN TRONG ANH* (Laboratoire des Mkanismes Re'actionnels, Bdtiment 420, Centre d'Orsay de I ' Universite' Paris-XI, 9 1-Orsay, Fran,e) Summary Application of the "hard and soft" concept to the W-oodward-Katz model allows simple and accurate prediction of the structure of the major product in Diels-Alder reactions.
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