Palladocarbosilane dendrimers as catalysts for the asymmetric hydrovinylation of styrene in supercritical carbon dioxide期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Palladocarbosilane dendrimers as catalysts for the asymmetric hydrovinylation of styrene in supercritical carbon dioxide

Authors:	Lara-Isabel Rodrí guez,Miquel Seco,Anna M. Masdeu-Bultó

Affiliation:	^a Departament de Química Inorgànica, Universitat de Barcelona, Martí i Franquès, 1-11, 08028 Barcelona, Spain ^b Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel·lí Domingo s/n, 43007 Tarragona, Spain

Abstract:	The palladocarbosilane dendrimers 2 and 3, containing the P-stereogenic phosphine [P(2-biphenylyl)PhCH₂] fragment, and the model compound Me₃Si(P(2-biphenylyl)PhCH₂)(PdCl(η³-2-MeC₃H₄)), 1, were tested as precatalysts in the hydrovinylation of styrene, in supercritical CO₂ medium. Na[BARF] was used as a cocatalyst. In all cases, the activity was somewhat less than that observed in CH₂Cl₂, but the selectivity and enantiomeric excess were excellent and comparable with the results obtained using the conventional solvent.

Keywords:	Dendrimer Palladium Asymmetric hydrovinylation Supercritical carbon dioxide
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