ChemCatChem

Cover image for Vol. 8 Issue 3

Editor: Michael Rowan; Editorial Board Chairs: Uwe Bornscheuer, Luis A. Oro, Bert Weckhuysen

Impact Factor: 4.556

ISI Journal Citation Reports © Ranking: 2014: 31/139 (Chemistry Physical)

Online ISSN: 1867-3899

Associated Title(s): Advanced Synthesis & Catalysis, Angewandte Chemie International Edition, Chemistry - A European Journal, ChemBioChem, ChemElectroChem, ChemPhysChem, ChemSusChem

3_05/2011Cover Picture: Mechanistic Study of the Pd/TOMPP-Catalyzed Telomerization of 1,3-Butadiene with Biomass-Based Alcohols: On the Reversibility of Phosphine Alkylation (ChemCatChem 5/2011)

The cover picture shows a view inside of the ‘black box’ of the Pd/TOMPP-catalyzed (TOMPP=tris(2-methoxyphenyl)phosphine) telomerization reaction of 1,3-butadiene with carbohydrate substrates. The detailed analysis of post-catalytic reaction mixtures, in the Full Paper on p. 845 ff., A. L. Spek, R. J. M. Klein Gebbink, B. M. Weckhuysen et al., revealed that the phosphine is converted to the phosphonium species and that this process is the main cause of catalyst deactivation. Coordination studies on the in situ formed phosphonium species show that this reaction is reversible and that the key catalytic intermediate [Pd(1,2,3,7,8-η5-octa-2,7-dien-1-yl)(TOMPP)]+ can be reformed. This illustrates that the ‘gears’ of the reaction mechanism can be rewound to study the reaction pathways and intermediates involved in phosphonium formation.

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