Cyclopentenyliden‐Komplexe aus Alkinylcarben‐Komplexen, Lithiumaryl und H + | Zendy

Fischer Helmut | Zendy; Meisner Thomas | Zendy; Hofmann Josef | Zendy

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Cyclopentenyliden‐Komplexe aus Alkinylcarben‐Komplexen, Lithiumaryl und H +

Author(s) -

Fischer Helmut,

Meisner Thomas,

Hofmann Josef

Publication year - 1990

Publication title -

chemische berichte

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.667

H-Index - 136

eISSN - 1099-0682

pISSN - 0009-2940

DOI - 10.1002/cber.19901230907

Subject(s) - chemistry , carbene , medicinal chemistry , ligand (biochemistry) , chromium , methylene , ether , alkoxy group , stereochemistry , metathesis , enol ether , cyclopentene , polymerization , organic chemistry , catalysis , biochemistry , alkyl , receptor , polymer

Cyclopentenylidene Complexes from Alkinylcarbene Complexes, Aryllithium and H + [Alkoxy(phenylethynyl)carbene]pentacarbonyl complexes of chromium and tungsten, (CO) 5 M[C(CCPh)OR] ( 1 ) (M Cr, W, R Me, Et) react with Li[C 6 H 4 R′‐ p ] (R′ H, Me) and HBF 4 ‐ Et 2 O to give the vinylcarbene complexes (CO) 5 ‐M{C[CHC(Ph)C 6 H 4 R′‐ p ]OR} 2 and two isomeric cyclopentenylidene complexes 3 and 4 . The cyclopentenylidene ligand is formed from two carbene ligands of 1 , [C 6 H 4 R′‐ p ] − and H + . The structure of 4a (M W, R Et, R′ Me) is established by an X‐ray structure analysis. The product ratio strongly depends on the reaction conditions. The complex 3c (M Cr, R R′ Me) reacts with ethyl vinyl ether to give the 3,5‐bis(methylene)cyclopentene derivative 8 by metathesis.

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