All articles of this category Radical addition reactions to acyclic alkenes 5 (diethyl citraconate) and 9 (methyl 3-hydroxy-2-methylenebutanoate) yield mainly threo product 7 (diethyl 2- tert -butyl-3-methylbutanedioate) and erythro product 11 [methyl 2-( tert -butylmethyl)-3-hydroxy-butanoate], respectively. Related cyclic alkenes 6 (citraconic anhydride) and 13 (2-cyclohexyl-6-methyl-5-methylene-1,3-dioxan-4-one) also react with high but opposite diastereoselectivity. This reversal of stereoselectivity reflects changes in the conformation of the intermediate radicals.
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Bulliard et al. (1991) studied this question.
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