Dehydroformylation, a challenging, underexplored reaction, can be performed under mild conditions using a designed cooperative base metal catalyst system.
Metal carbenes, derived
from the decomposition of diazo compounds, are valued for their capacity
to perform a variety of transformations. A unique class of acyclic,
bis-diazo compounds, the donor–acceptor–acceptor 1,3-bisdiazo
compounds, are described herein. These compounds are available from
acyclic β-keto esters and especially reactive at the donor–acceptor
diazo unit. These bisdiazo compounds react smoothly with rhodium acetate
and alcohols to give monodiazo, cyclic orthoesters, presumably through
the capture of a transient oxonium ylide.
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