A Simple Cobalt Catalyst System for the Efficient and Regioselective Cyclotrimerization of Alkynes.
β Scribed by Gerhard Hilt; Thomas Vogler; Wilfried Hess; Fabrizio Galbiati
- Publisher
- John Wiley and Sons
- Year
- 2005
- Weight
- 17 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0931-7597
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## Abstract The palladacycle [Pd(__k__^__2__^__βC__,__N__βCο£Ύ(C~6~H~5~)C(Cl)CH~2~NMe~2~)(ΞΌβCl)]~2~ (1) derived from the chloropalladation of 3β(dimethylamino)β1βphenylβ1βpropyne and its phosphine adduct [Pd(__k__^__2__^__βC__,__N__βCο£Ύ(C~6~H~5~)C(Cl)CH~2~NMe~2~)P(4βCF~3~C~6~H~4~)~3~(Cl)] (3) promote
Not a Diels-Alder reaction but a 1,4-hydrovinylation takes place on treatment of 1,3-dienes with functionalized alkenes in the presence of the catalyst system [CoBr (dppe)]/ZnI /Bu NBH (dppe = 1,2-bis(diphenylphosphanyl)ethane). With this reaction the 1,4-dienes with different substituents R -R can