SYNTHESIS, STRUCTURE AND PROPERTIES OF NEW TRANSITION METAL COMPLEXES OF 9,10-DIHYDRO-9,10-DIMETHYL-9,10-DIBORAANTHRACENE [German]

摘要

Reactions of 9,10-Dihydro-9,10-dimethyl-9,10-diboraanthracene (1) with the isolobal 14 VE metal complex fragments Ru(CO)(3), Co(C5H5), Fe(C7H8) and Ni(C8H12) yield the 18 VE compounds 2, 3, 4, and 5. With (CO)(3)Cr(CH3CN)(3) complexation takes place at the carbacyclic moiety of 1 to give 6. Neither reduction nor carbonylation of 6 at 40 bar CO pressure result in a slippage of the chromium carbonyl group towards the heterocyclic part of 1. The reaction of 3 with (CO)(3)Cr(CH3CN)(3) leads to the 34 VE ''slipped'' triple-decker 7. The complexes 2, 3, and 4 are reversibly reduced to give the paramagnetic 19 VE monoanions. The electrochemistry of 2, 3, and 4 as well as ESR data of 3(-) and 4(-) are reported. The constitutions of 2, 3, 4, and 5 have been confirmed by X-ray structure analyses. [References: 41]