“…[9] On the other hand, the oxyallyl cation could undergo ac oncerted or stepwise [3+ +3] cycloaddition with permanganate to produce ah ypomanganate ester (Mechanism B), in ah omologous process to the [3+ +2] step that initiates alkene cleavage.T hrough equilibrium of the Mn V complexes,the aoxyanion could react with an additional Mn VII ,a ffording tricyclic manganese complex A.Considering the initial [3+ +3] cycloaddition provides syn-a,a' substituents,t he tricyclic complex A would be a cis,trans-angular structure bearing significant strain, which may disfavor this pathway.N otably, in either mechanism the discharge of carbon dioxide rather than carbon monoxide is proposed. Qualitative analysis via conversion of Ba(OH) 2 to BaCO 3 provides support for the formation of CO 2 . [13] However,f urther mechanistic studies entailing characterization of minor side-products and attempts to intercept proposed intermediates remain to be done.…”