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- W2008483766 abstract "This chapter focuses on the advances made in the pentadienyl chemistry of three elements—namely, titanium, zirconium, and hafnium. As group 4 transition metals, these elements generate a rich coupling chemistry, and as their metallocenes also they have proven to be remarkably unique. The chapter describes some of the most commonly used pentadienyl ligands as illustrated in a chart. In general, a numbering scheme is utilized in which the dienyl termini are defined as C1 and C5, with C2–C4 appearing between C1 and C5. Formally, any charge delocalized over the dienyl fragment can be shared by C1, C3, and C5, leaving C2 and C4 uncharged. The metals themselves play a further role by promoting coupling reactions between unsaturated organic molecules and pentadienyl ligands, much as had already been observed for early metal diene complexes. A number of open and half-open titanocenes, zirconocenes, and hafnocenes have been reported to yield catalysts for the hydrogenation of unsaturated polymers such as polybutadiene. The hydrogenations are carried out in solution phase, and generally are very efficient (84–89%). In addition, the chapter discusses reactions in which pentadienyl ligands are altered, as may occur via a coupling reaction, and applications of metal pentadienyl compounds in materials and catalytic processes." @default.
- W2008483766 created "2016-06-24" @default.
- W2008483766 creator A5023494125 @default.
- W2008483766 creator A5027417489 @default.
- W2008483766 date "2007-01-01" @default.
- W2008483766 modified "2023-09-24" @default.
- W2008483766 title "Pentadienyl Complexes of the Group 4 Transition Metals" @default.
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