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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.