Abstract
Synthesis, characterization, and reactivity of new allyl cyclopentadienyl molybdenum(II) compounds [(η3-C3H4R1)(η5-C5H3(R2)2)Mo(CO)2] (R1 = H, COOMe; R2 = COOMe, CONHtBu) are reported. Although these compounds are structural analogues of [(η3-C3H5)(η5-Cp)Mo(CO)2], their reactivity is very different. While protonation of [(η3-C3H5)(η5-Cp)Mo(CO)2] gives a cationic cyclopentadienyl complex, the presented compounds give cationic allyl complexes [(η3-C3H4R)Mo(CO)2(NCMe)3][BF4] (R = H, COOMe) or stable cationic allyl cyclopentadienyl complexes. The theoretical calculations have shown that this behavior is a result of high affinity of the functional groups in the cyclopentadienyl ligand toward protonation.
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