REACTIONS OF COORDINATED CYCLIC POLYOLEFINS. THE SYNTHESIS AND CYCLOADDITION REACTIONS OF TRICARBONYLIRON

Article abstract of DOI:10.1016/0022-328X(83)85162-6

The synthesis of tricarbonyl<1-4-η>-3,7,7-trimethylcycloheptatriene>iron (III) by two independent routes is reported.The regiospecificity of the reactions is considered in terms of frontier molecular orbitals.Complex III reacts with tetracyanoethylene to form a mixture of 1,3- and 1,6-cycloadducts in 4/1 ratio.Diphenylketene (DPK) forms a 2 + 2 adduct with III at room temperature.At 80 deg C an acylated addition product is obtained.In general, steric hindrance increases the yield of products formed via bipolar reactions at the expense of those formed via concerted pathways.