Mechanistic Study of the Pd/TOMPP-Catalyzed Telomerization of 1,3-Butadiene: Influence of Aromatic Solvents on Bis-Phosphine Complex Formation and Regioselectivity
作者:Peter J. C. Hausoul、Martin Lutz、Johann T. B. H. Jastrzebski、Pieter C. A. Bruijnincx、Bert M. Weckhuysen、Robertus J. M. Klein Gebbink
DOI:10.1021/om400246a
日期:2013.9.23
on the Pd/TOMPP-catalyzed (TOMPP = tris(2-methoxyphenyl)phosphine) telomerization of 1,3-butadiene with phenols revealed that the composition of the reaction medium strongly influences the regioselectivity of the telomer products. Mechanistic studies show this effect to be related to the stability of the key catalytic intermediate cis-[Pd((1–3η)-octa-2,7-dien-1-yl)(TOMPP)2]+ (E), which mainly depends
The first example is reported of a palladium-catalysed Cyclodimerization of butadiene to 2-vinylmethylenecyclopentane occurring in catalytic turnovers and yields far superior to the nickel-based systems, which are claimed to be specific for cyclodimerization reactions.