CHELATED ALKYL HALIDE MANGANESE COMPLEXES (ETA(5) ETA(1)-C5H4CH2CH2X)MN(CO)(2) FROM PHOTOLYSIS OF (ETA(5)-C5H4CH2CH2X)MN(CO)(3)/

Manganese tricarbonyl complexes (eta(5)-C5H4CH2CH2Br)Mn(CO), (3) and ( eta(5)-C5H4CH2CH2I)Mn(CO)(3) (4), with an alkyl halide side chain atta ched to the cyclopentadienyl ligand, were synthesized as possible prec ursors to chelated alkyl halide manganese complexes. Photolysis of 3 o r 4 in toluene, hexane of acetone-d(6) resulted in CO dissociation and intramolecular coordination of the alkyl halide to manganese to produ ce ( eta(5):eta(1)-C5H4CH2CH2Br)Mn(CO)(2) (5) and (eta(5):eta(1)-C5H4C H2CH2I)Mn(CO)(2) (6). Low temperature NMR and IR spectroscopy establis hed the structures of 5 and 6. Photolysis of 3 in a glass matrix at 91 K demonstrated CO release from manganese. Low temperature NMR spectro scopy established that the coordinated alkyl halide complexes are stab le to approximately - 20 degrees C. (C) 1998 Elsevier Science S.A. All rights reserved.