ChemInform Abstract: Effect of H‐Donor and Temperature on the Stereoselectivity of Radical Reactions.

Abstract

084ChemInform Abstract Using vinyl radical (II) formed by addition of cyclohexyl radicals to phenylacetylene as an example it is demonstrated that variation of the H-donor as well as of the reaction temp. (-20 to 260 rc C) affects the (Z)/(E) relation of products (I) and (III), which may even be reversed. About 60-80 rc C there is an isoselective temp. at which all three H-donors studied possess the same stereoselectivity. The results obtained are interpreted with changes in activation parameters which are tabulated.