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Chromium–Copper Exchange of Fischer Carbene Complexes: X‐Ray Crystal Structure of a [Cu{=CR 1 (OR 2 )}(MeCN)(Et 2 O)][PF 6 ] Complex
Author(s) -
Barluenga José,
López Luis A.,
Löber Oliver,
Tomás Miguel,
GarcíaGranda Santiago,
AlvarezRúa Carmen,
Borge Javier
Publication year - 2001
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/1521-3773(20010917)40:18<3392::aid-anie3392>3.0.co;2-y
Subject(s) - carbene , chromium , copper , chemistry , ligand (biochemistry) , crystallography , crystal structure , ethyl diazoacetate , medicinal chemistry , stereochemistry , catalysis , organic chemistry , cyclopropanation , receptor , biochemistry
The chromium–copper interaction is evidenced for chromium–carbene complexes and Cu + in the CuBr‐catalyzed cross‐coupling reaction of ethyl diazoacetate (EDA) and Fischer alkoxycarbene–chromium complexes (see scheme). In contrast, with [Cu(MeCN) 4 ][PF 6 ] (0.5 equiv) instead of CuBr a carbene ligand exchange between a chiral alkenylchromium carbene complex (R 1 =( E )‐CH=CH‐2‐furyl, R 2 =(1 R , 2 S , 5 R )‐menthyl) and this Cu compound occurs at room temperature. The resulting novel trigonal‐planar copper( I )–carbene complex, which contains MeCN and Et 2 O as the remaining ligands, has been isolated and structurally characterized by X‐ray diffraction.