Komplexierung von 1,3‐Dihydro‐1, 3, 10, 10‐tetramethyl‐1, 3‐dibora‐4, 5‐benzopentafulven mit Fe(CO) 3 ‐ und CpCo‐Fragmenten: Synthese, Kristall‐ und Elektronenstruktur von Tricarbonyl[η 5 ‐cyclopentadienyl)cobalt] [μ,η 5 :η 4 ‐(1, 3‐dihydro‐1, 3, 10, 10‐tetramethyl‐1, 3‐dibora‐4, 5‐benzopentafulven)]eisen

Complexation of 1, 3‐Dihydro‐1, 3, 10, 10‐tetramethyl‐1, 3‐dibora‐4, 5‐benzopentafulvene with Fe(CO) 3 and CpCo Fragments: Synthesis, Crystal and Electronic Structure of Tricarbonyl[(η 5 ‐cyclopentadienyl)cobalt][μ,η 5 :η 4 ‐(1, 3‐dihydro‐1, 3, 10, 10‐tetramethyl‐1, 3‐dibora‐4, 5‐benzopentafulvene)]iron Reaction of the 1, 3‐dibora‐4, 5‐benzopentafulvene 1 with the isolobal organometallic fragments Co(C 5 H 5 ) and Fe(CO) 3 leads to the slipped triple‐decker complex 5 . It is also formed when 2 is stacked with the Co(C 5 H 5 ) fragment. The X‐ray structure analysis of 5 reveals that the Co(C 5 H 5 ) fragment is coordinated to the 1, 3‐diborole ring, and the Fe(CO) 3 group interacts with the Y‐shaped B 2 CC unit. An MO calculation indicates that the formation of 5 occurs by distortion of 2 (η 5 ‐ → η 4 ‐bonding) and complexation of the Co(C 5 H 5 ) group. 5 is 16 kcal/mol more stable than its structural isomer 6 .