By Alois Fuerstner
The great development in olefin metathesis completed over the last decade can rarely be overvalued. as a result of the improvement of a brand new iteration of good outlined and high-performance organometallic catalysts, this response is swiftly evolving into the most flexible instruments for complex natural chemistry, common product synthesis, effective chemical creation and polymer sciences. Written via many of the prime specialists during this box, this monograph intends to familiarize the reader with the main interesting advancements and frontiers during this flourishing box of chemistry study.
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Additional info for Alkene Metathesis in Organic Synthesis (Topics in Organometallic Chemistry) (Vol 1)
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0]decadiene product 28. 0] compound 32 is formed exclusively, because the cyclization cascade is then triggered at the other end of the substrate. Note that in both examples trisubstituted oleﬁns are obtained by means of a ruthenium based metathesis catalyst ! The idea of determining the site of initiation via the substitution pattern of the oleﬁn has also been used by Blechert et al. during the course of a stereocontrolled RCM process (Scheme 10). Again, the reaction starts most likely at the terminal oleﬁn site in 33 independent of whether 1 or 24 is used as catalyst; however, due to the different coordination geometries of ruthenium and molybdenum, the evolving carbene reacts with either diastereotopic oleﬁn attached to 50 A.
66 References . . . . . . . . . . . . . . . . . 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.
Alkene Metathesis in Organic Synthesis (Topics in Organometallic Chemistry) (Vol 1) by Alois Fuerstner