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traditional alkoxy-carbonylation conditions, are transformed
into the corresponding esters in high yields and selectivity (1t,
1u, 1v), too. Furthermore, internal olefins (1w,1x) were
transformed into diester products, which might be of interest
for polymers. Another potential industrial application is the
alkoxycarbonylation of diisobutene (DIB, 2b).12 To our delight,
our catalytic system allowed complete transformation of the
substrate with 91% yield. Compared to the related palladium
catalyst, the Pt catalytic system is more sensitive to steric
hindrance, e.g. for tetra-substituted olefins (2c, 2d) the yield
decreased significantly. We explain observation by the lower
binding affinity of these substrates towards the metal center
and formation of unwanted ether by-products.13
140, 4157-4163.
DOI: 10.1039/D0CC00650E
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In summary, we demonstrate for the first time a general Pt-
catalyzed alkoxycarbonylation of olefins. By using specific
ligands such as L17 the activity of the metal center is greatly
improved, and the catalyst system becomes comparable with
the palladium catalyst. At the same time, this Pt catalytic
system shows excellent reactivity for bulk olefin feedstocks
and good compatibility for various functional groups, which
provide
new
inspiration
for
platinum-catalyzed
alkoxycarbonylations.
Conflicts of interest
There are no conflicts to declare.
Acknowledgements
This work has been funded by Evonik Industries and the
German Federal Ministry BMBF and the State of Mecklenburg-
Western Pommerania. The author Ji Yang thanks China CSC
Scholarship for financial support (201704910879).
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