Tetrazole and triazole carbene complexes of group 6 metal carbonyls
作者： Guido D. Frey , Karl Öfele , Herbert G. Krist , Eberhardt Herdtweck , Wolfgang A. Herrmann
DOI: 10.1016/J.ICA.2005.09.049
关键词: Metal carbonyl 、 Stereochemistry 、 Tetrazole 、 Pyridine 、 Spectroscopy 、 Ligand 、 Medicinal chemistry 、 Chemistry 、 Triazole 、 Salt (chemistry) 、 Carbene
摘要: Abstract In order to study the relative stability of cis- and trans-isomers bis(NHC)tetracarbonyl complexes group 6 metals, we synthesized corresponding with triazolin- tetrazolinylidene ligands. By reaction free carbene (L = 1,3,4-triphenyl-4,5-dihydro-1H-1,2,4-triazolin-5-ylidene) – first by Enders hexacarbonyls Cr, Mo W M(L)(CO)5 are generated. Depending on an excess also cis-(L)2Mo(CO)4 complex was obtained. The latter can be photolytically converted trans-(L)2Mo(CO)4 complex. 1,4-dimethyltetrazolin-5-ylidene ligand (L′), Cr(L′)(CO)5, cis-(L′)2Cr(CO)4 trans-(L′)2Cr(CO)4 obtained hexacarbonyl-μ-trihydroxy-dichromate dimethyltetrazolium salt. complex, one carbonyl replaced donor ligands such as pyridine or phenylisocyanide form sym–mer-tricarbonyl complexes. All new fully characterized spectroscopy most single-crystal X-ray analysis.
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