Ho, Joanne H H; Hodgson, Richard; Wagler, Jorg; Messerle, Barbara Ann
A highly efficient rhodium(i) and iridium(i) catalysed dihydroalkoxylation reaction of alkyne diols is employed here for the synthesis of spiroketals and a fused bicyclic ketal. The two metal catalysts show differential selectivity and efficiency for either the cyclisation of the 5-exo or 6-endo-membered rings. For the first time, a dual metal (Rh and Ir) catalyst system is effectively utilised for the formation of the 5,6-spiroketals, more efficiently than the single metal catalysts. The two...[Show more]
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