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Transition Metal Complexes of Diazenes, XXX. - On the Photoreaction of Octacarbonyl Dimetallaheterocycles with Bis(phosphanes)
Kisch, Horst,Holzmeier, Peter,Knoch, Falk
, p. 1083 - 1086 (2007/10/02)
Irradiation of (CO)4Cr(μ-pmd)2Cr(CO)4 (1) (pmd = 3,3-pentamethylenediazirine) in the presence of bis(dimethylphosphanyl)methane (dppm) affords (CO)3Cr(μ-pmd)2(μ-dppm)Cr(CO)3 (2b) and (CO)4Cr(μ-pmd)(μ-dppm)Cr(CO)4 (3b) which both contain boat-like dimetallaheterocyclic rings as indicated by X-ray analysis.Contrary to that, in the presence of cis-1,2-bis(diphenylphosphanyl)ethene the reaction affords the known Cr(CO)4(cdpe) (4c) by complete cleavage of the dimetallaheterocycle.Key Words: Dichromium carbonyls / Diazirine complexes / Dimetallaheterocycles / Photosubstitution / Bis(phosphanes)
