Abstract
AbstractTetracyclopropylcyclopentadienone, upon liberation from its previously known tricarbonyliron complex 3, undergoes rapid [4+2] cyclodimerization to the highly congested1,2,4,5,6,7,8,9‐octacyclopropyltricyclo[5.2.1.02,6]deca‐4,8‐diene‐3,10‐dione (6) which was characterized by an X‐ray crystal structure analysis. Upon alkylation of 3 with Me3OBF4 as well as protonation with HBF4 or CF3SO3H, the remarkably stable cationic tricarbonyl(tetracyclopropylcyclopentadienyl)iron complexes 9, 10 and 11, 12, respectively, were obtained in high yields (91, 87 and 74, 79 %, respectively). X‐ray crystal structural data for 11 and 12 as well as NMR‐ and IR spectroscopic evidences for all four new complexes 9–12 indicate that their positive charge predominantly rest on the tricarbonyliron fragments. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
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