In this synthesis, diazo compounds are commonly used as carbene precursors. Diazo compounds are organic molecules that contain a diazo functional group (R2C=N2). They can be generated from different starting materials, such as tosylhydrazones, by treatment with a diazo transfer reagent, typically a rhodium carboxylate or a copper carbenoid precursor.
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methyl 4,6-O-benzylidene-2-O-diazoacetyl-3-O-pivaloyl-α-D-mannopyranoside
