Regioselective addition of an alkyne to both CO and CNPr functionalities in osmium clusters
Abstract
Reaction of [Os
3
(CO)
10
(CNPr)(NCMe)] with methyl
propiolate at 0 °C gave
[Os
2
(CO)
6
{µ-η
2
:η
3
-C(OH)C(CO
2
Me)![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
CHCNHPr}] as the major
product and
[Os
2
(CO)
6
{µ-η
2
:η
3
-C(OH)CHC(CO
2
Me)CNHPr}] as the minor
product, in which two kinds of C–C bond formations occur
regioselectively involving coupling of alkyne and CO as well as coupling
of alkyne and CNPr; the stereochemistry is likely to be mediated by the
co-ordinated isocyanide.
CHCNHPr}] as the major
product and
[Os
2
(CO)
6
{µ-η
2
:η
3
-C(OH)CHC(CO
2
Me)CNHPr}] as the minor
product, in which two kinds of C–C bond formations occur
regioselectively involving coupling of alkyne and CO as well as coupling
of alkyne and CNPr; the stereochemistry is likely to be mediated by the
co-ordinated isocyanide.
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