© WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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
Cover 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.