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Detection of the Tungsten–Carbene–Olefin Intermediates in Catalytic Metathesis Systems Containing High‐Valent Metal Centers
Author(s) -
Kress Jacky,
Osborn John A.
Publication year - 1992
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.199215851
Subject(s) - carbene , olefin metathesis , catalysis , chemistry , cycloheptene , olefin fiber , photochemistry , olefin polymerization , tungsten , metal , ring (chemistry) , polymer chemistry , polymerization , metathesis , ring opening polymerization , medicinal chemistry , organic chemistry , polymer
The catalytic ring‐opening polymerization of cycloheptene 2 proceeds through the rearrangement of 3 to give the corresponding metallacyclobutane. Compound 3 , which is prepared in situ by addition of 2 to the carbone complex 1 and can be characterized by low‐temperature 1 H and 13 C NMR spectroscopy, is therefore considered a key intermediate for these reactions that are also commercially important. Complexes of this type have up to now been postulated but not detected for catalytic olefin metatheses. R = CH 2 CMe 3 .