By Alois Fuerstner
Content material: Olefin metathesis through well-defined complexes of molybdenum and tungsten / R.R.Schrock -- Ruthenium-catalyzed metathesis reactions in natural synthesis / A. Furstner -- Ring-closing metathesis within the synthesis of epothilones and polyether normal items / K.C. Nicolaou, N.P. King, Y. He -- Catalytic ring-closing metathesis and the improvement of enantioselective methods / A.H. Hoveyda -- Enyne metathesis / M. Mori -- Cross-metathesis / Susan E. Gibson, S.P. willing -- fresh advances in ADMET chemistry / D. Tindall, J.H. Pawlow and K.B. Wagener -- Bioactive polymers / L.L. Kiessling, L.E. robust
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Additional resources for Alkene Metathesis in Organic Synthesis
38 2 Synthesis, Structure, Mechanism and Activity of Ruthenium-Based Metathesis Catalysts . . . . . . . . 3 Ruthenium Carbene Complexes and General Aspects of RCM . . Ruthenium Allenylidene Complexes . . . . . . . . . Less Deﬁned Ruthenium Catalysts . . . . . . . . . . 39 43 46 3 The Application Proﬁle of the Standard Ruthenium-Based Metathesis Catalysts in Synthesis . . . . . . . . . . 5 Effects of Oleﬁn Substitution . . . .
70 1 Introduction The metathesis activity of various simple ruthenium compounds has already been discerned during early studies on the ring opening metathesis polymerization (ROMP) of norbornene and other cycloalkene substrates [1, 2]. A real breakthrough, however, was achieved when Grubbs et al. reported in the early 1990s that ruthenium-carbene complexes of the general type 1 are highly active single component (pre)catalysts for any kind of oleﬁn metathesis reaction (Fig.
1 Effects of Olefin Substitution The ruthenium compounds described above show a distinctly lower metathetic activity than the molybdenum alkenylidene complex 24 developed by Schrock et al. (Fig. R. Schrock, this volume) , which is another standard catalyst for any type of oleﬁn metathesis reaction. However, they 47 Ruthenium-Catalyzed Metathesis Reactions in Organic Synthesis Fig. 4 compensate for this lower intrinsic reactivity by an increased tolerance towards functional groups and a somewhat higher selectivity (cf.
Alkene Metathesis in Organic Synthesis by Alois Fuerstner