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Synthesis and Structural Characterization of Novel Oxorhenium( V ) Complexes Containing N‐Heterocyclic Carbenes
Author(s) -
Royo Beatriz,
Herdtweck Eberhardt,
Romão Carlos C.
Publication year - 2004
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200400072
Subject(s) - carbene , chemistry , cationic polymerization , yield (engineering) , transition metal carbene complex , stereochemistry , salt (chemistry) , crystal structure , crystallography , medicinal chemistry , polymer chemistry , organic chemistry , catalysis , materials science , metallurgy
Reaction of [ReOCl 3 (PPh 3 ) 2 ] with 2 equiv. of 1,3‐diisopropylimidazol‐2‐ylidene ( i Pr‐carbene) affords [ReOCl 3 ( i Pr‐carbene) 2 ] ( 1 ). When an excess of free carbene is used, the dicationic species [ReOCl( i Pr‐carbene) 4 ][Cl] 2 ( 2 ) is isolated. The cationic dioxorhenium complex [ReO 2 ( i Pr‐carbene) 4 ] + has been isolated as its I − ( 3 ) and ReO 4 − ( 4 ) salts by different reactions. Treatment of [ReO 2 I(PPh 3 ) 2 ] with an excess of 1,3‐diisopropylimidazol‐2‐ylidene yields compound 3 in quantitative yield. The cationic species is also isolated as an ReO 4 − salt from the reaction of [ReO 2 Me(PhCCPh)] with 1,3‐diisopropylimidazol‐2‐ylidene. The molecular structures of [ReOCl 3 ( i Pr‐carbene) 2 ] ( 1 ) and [ReO 2 ( i Pr‐carbene) 4 ][ReO 4 ] ( 4 ) have been determined by single‐crystal X‐ray diffraction. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)