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Oxorhenium(V) Complexes with 1,3,4‐Triphenyl‐1,2,4‐triazol‐5‐ylidene
Author(s) -
Braband Henrik,
Blatt Oliver,
Abram Ulrich
Publication year - 2006
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200600139
Subject(s) - chemistry , carbene , protonation , medicinal chemistry , denticity , triphenyl phosphite , metal , stereochemistry , polymer chemistry , organic chemistry , catalysis , ion
Reactions of the oxorhenium(V) complexes [ReOX 3 (PPh 3 ) 2 ] (X = Cl, Br) with the N‐heterocyclic carbene (NHC) 1,3,4‐triphenyl‐1,2,4‐triazol‐5‐ylidene (L Ph ) under mild conditions and in the presence of MeOH or water give [ReOX 2 (Y)(PPh 3 )(L Ph )] complexes (X = Cl, Br; Y = OMe, OH). Attempted reactions of the carbene precursor 5‐methoxy‐1,3,4‐triphenyl‐4,5‐dihydro‐ 1H ‐1,2,4‐triazole ( 1 ) with [ReOCl 3 (PPh 3 ) 2 ] or [NBu 4 ][ReOCl 4 ] in boiling xylene resulted in protonation of the intermediately formed carbene and decomposition products such as [HL Ph ][ReOCl 4 (OPPh 3 )], [HL Ph ][ReOCl 4 (OH 2 )] or [HL Ph ][ReO 4 ] were isolated. The neutral [ReOX 2 (Y)(PPh 3 )(HL Ph )] complexes are purple, airstable solids. The bulky NHC ligands coordinate monodentate and in cis ‐position to PPh 3 . The relatively long Re–C bond lengths of approximate 2.1Å indicate metal‐carbon single bonds.