Abstract
Niobocene ketene complex 1 has been utilized as an oxygen atom transfer reagent, converting ketones and aldehydes to esters and carboxylic acids. The steric properties of compound 1 give rise to a series of relative migratory aptitudes that differs from those seen for peracids. The process may be rendered catalytic in 1 with methyltrifluoromethyldioxirane ( 4).
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