作者:Cornelius G. Kreiter、Mike Packheiser、Walter Frank、Vera Reiland、Franz-Georg Wittmer
DOI:10.1016/s0020-1693(99)00320-5
日期:1999.12
Pentacarbonyl(mu-eta(5:3)-4H-indenyl)diiron(Fe-Fe) (1) reacts upon UV irradiation with dimethyl 2-butynedioate (A) or methyl propynoate (B) by H-transfer to substituted pentacarbonyl(eta(5)-indenyl)[mu-eta(2:1)-vinyl]diiron(Fe-Fe) complexes (2A, 2B). With ethynylethylether (C) complex 1 yields pentacarbonyl- (3), and tetracarbonyl[mu-1-3a(7a),2'-eta:6,7,1',2'-eta-4,5-dihydro-5-(3'-oxo-1'- penten-1'-yl)indenyl]diiron(Fe-Fe) (4) by a C-C bond formation. The photoreaction of complex 1 with cis-cyclooctene (D) in toluene leads, without CO elimination by hapticity change to pentacarbonyl(eta(2)-cis-cyclooctene)(mu-eta(5:1)-4H-indenyl)diiron(Fe-Fe) (5) which stays during irradiation in equilibrium with 1 and D. In the dark 1 is re-formed quantitatively. Complex 5 reacts in situ with A to form dicarbonyl[1,2-bis(methoxycarbonyl)vinyl-kappa C-1](eta(5)-indenyl)iron (7) With C, complexes 3 and 4 are obtained. In solution 4 loses a Fe(CO)(2) unit and yields crude dicarbonyl[1-3a(7a),2'-eta-4,5-dihydro-5-(3'-oxa-1'-penten-1'-yl)indenyl]iron (8) During chromatography on alumina 8 is hydrolysed and rearranged to dicarbonyl(1-3a(7a),2'-eta-4,5-dihydro-5-methylenecarbonyl-indenyl)iron (9). Crystal and molecular structures were determined for 3 and 4. The constitutions of the other products are developed on the basis of IR, MS, and H-1 NMR spectroscopic data. (C) 1999 Elsevier Science S.A. All rights reserved.