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Frontispiece: Molybdenum Imido, Tungsten Imido and Tungsten Oxo Alkylidene N‐Heterocyclic Carbene Olefin Metathesis Catalysts
Author(s) -
Buchmeiser Michael R.
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201885461
Subject(s) - carbene , molybdenum , tungsten , catalysis , metathesis , chemistry , cationic polymerization , alkoxide , trifluoromethanesulfonate , medicinal chemistry , olefin metathesis , olefin fiber , tungsten compounds , valence (chemistry) , polymer chemistry , organic chemistry , polymerization , polymer
The fundamental concept to molybdenum/tungsten imido and tungsten oxo alkylidene N‐heterocyclic carbene (NHC) catalysts for olefin metathesis is outlined. The neutral 16‐valence electron (VE) complexes [M(X)(NHC)(CHR)(Y)(Y’)] (M = Mo, W; X = O, NR′′; Y, Y′ = triflate, alkoxide) serve as precursors for the corresponding cationic, tetracoordinated 14‐VE catalysts [M(X)(NHC)(CHR)(Y) + (Y′) − ] in which Y′ is a non‐coordinating anion. This novel class of olefin metathesis catalysts shows high activity, productivity, stereospecifity and substantial functional group tolerance. For more details, see the Concept article by M. R. Buchmeiser on page 14295 ff.