Scheme 3 Synthesis of 1,2-dioxan-3-ol using Mn(acac)3 or Mn(OAc)3

the 1,2-dioxane derivatives were also formed by the reaction of alkenes with 1,3-dicarbonyl compounds in the presence of manganese(III) acetate under mild conditions (Scheme 3). It was a significant discovery that octahedral manganese(III)-1,3-dicarbonyl enolate complexes also serve as molecular oxygen carriers analogous to the square planar manganese(III)-porphyrin and -salen complexes.

Thereafter, the discovery led to the synthesis of many functionalized 1,2-dioxane derivatives and dioxane-fused heterocyclic analogs.

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