The first dispiro orthoester via a spiroacetal oxo-carbenium ion is presented. Oxidative dearomatization of phloretic esters results in a bifunctional electrophilic spiroacetal oxo-carbenium ion, which undergoes a double nucleophilic addition by diol delivering a range of unusual dispiro-orthoesters with an excellent diversity.
M. Kumar, S. Singh and P. Subramanian, Chem. Commun., 2024, 60, 12860 DOI: 10.1039/D4CC03031A
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