By Alois Fuerstner
The large growth in olefin metathesis completed over the last decade can hardly ever be over priced. because of the improvement of a brand new iteration of good outlined and high-performance organometallic catalysts, this response is swiftly evolving into some of the most flexible instruments for complex natural chemistry, normal product synthesis, effective chemical creation and polymer sciences. Written through many of the top specialists during this box, this monograph intends to familiarize the reader with the main fascinating advancements and frontiers during this flourishing box of chemistry study.
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Extra resources for Alkene Metathesis in Organic Synthesis (Topics in Organometallic Chemistry) (Vol 1)
Recently an enantiomerically pure Mo(CHCMe2Ph)(N-2,6-i-Pr2C6H3)(O2R*) complex (O2R*=5,5',6,6'tetramethyl-3,3'-di-tert-butyl-1,1'-biphenyl-2,2'-diolate) has been prepared and employed for ARCM of substrates of the type shown in Eqs. 45 and 46 . Conversion of one enantiomer of A (Eq. 45; R=SiEt3) in a racemic mixture to give the ring-closed product in ~50% yield and ~95% ee suggests that this type of catalyst, or variations of it, are likely to have wide application in the construction of rings in an asymmetric manner.
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 . .
Therefore, a need for metathesis catalysts persists that exhibit essentially the same activity and application proﬁle as 1 but are signiﬁcantly easier to make. One class of compounds that might meet these criteria are ruthenium allenylidene complexes of the general type 2 (Fig. 1) . These cationic, 18 electron ruthenium species are the ﬁrst examples for the use of metal allenylidene complexes in catalysis in general. They are conveniently prepared in only two high yielding steps from commercially available and stable precursors (Scheme 7).
Alkene Metathesis in Organic Synthesis (Topics in Organometallic Chemistry) (Vol 1) by Alois Fuerstner