In the presence of Au nanoparticles supported on manganese oxide OMS-2 (Au/OMS-2), various kinds of β-heteroatom-substituted α,β-unsaturated ketones (heteroatom = N, O, S) can be synthesized through α,β-dehydrogenation of the corresponding saturated ketones using O (in air) as the oxidant. The catalysis of Au/OMS-2 is truly heterogeneous, and the catalyst can be reused.
The
selective dehydrogenative borylation of alkenes is an attractive
method for synthesizing useful borylalkenes. However, very few catalytic
systems have been reported that fulfill this objective. All the reported
examples are homogeneous catalysts with special ligands requiring
the usage of bases. This study describes the heterogeneously catalyzed
dehydrogenative borylation by supported copper hydroxide catalysts
(Cu(OH)
x
/support). In the presence of
Cu(OH)
x
/support and suitable ketones,
the dehydrogenative borylation of styrenes with bis(pinacolato)diboron
efficiently proceeded to selectively afford the corresponding β-monoboryl-
or β,β-diborylstyrenes. The observed catalysis was truly
heterogeneous, and the catalysts could be reused several times, though
their catalytic performance gradually declined.
Herein,
we report that highly dispersed Ni hydroxide species supported
on CeO2 act as an efficient heterogeneous catalyst for
the selective borylation of benzylic C(sp3)–H bonds
of alkylarenes including secondary derivatives, using pinacolborane
as the borylating agent. A thorough physicochemical analysis reveals
that in situ reduced ultrasmall Ni species on CeO2 during
the reaction are the actual active species responsible for the borylation.
Au nanoparticles supported on manganese oxide octahedral molecular sieve (OMS-2) can efficiently catalyze α,β-dehydrogenation of β-N-substituted saturated ketones using O2 as the terminal oxidant. However, despite the utility of this...
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