Stereospecific synthesis of trisubstituted and tetrasubstituted olefins. Conjugate addition of dialkylcopper-lithium reagents to. alpha.,. beta.-acetylenic esters

EJ Corey, JA Katzenellenbogen

Index: Corey,E.J.; Katzenellenbogen,J.A. Journal of the American Chemical Society, 1969 , vol. 91, # 7 p. 1851 - 1852

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Citation Number: 224

Abstract

ment of the observed energies and rotational strengths with those of our calculated data was found to be ex-~ e1lent. l~ The lowest triplet states are also localized in the flavin moiety in all three models. However, sensitive variations of the triplet-state energies with different models were displayed in the calculations. Experimental confirmation of this prediction is attempted. Most of the flavoenzymes have redox potentials considerably higher than that ...