Abstract
Comparison is made between the mass spectra of two isomeric tricarbonyl(cyclohexadiene)iron(0) complexes bearing 2-methyl-2-hydroxypropyl side-chains at either the 5- exo- or the 2-position. Both demonstrate a McLafferty rearrangement mechanism for an arene fragment bearing a coordinated atom of iron, but only the former shows a major competing pathway, since this involves a methylene group α to the point of attachment of the side-chain. The spectra of a variety of related complexes are discussed and a 1,3-shift of the residual C 6H 5Fe group is proposed.
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