| Abstract
| - The addition of [p-But-calix[4]-(O)4Mo], generated in situ from the reaction of [p-But-calix[4]-(OM)4] [M = Li, Na] with [MoCl4·(THF)2], with acetylenes led to the formation of 2-metallacyclopropenes, which are converted to the reactive corresponding 1-metallacyclopropene by addition of a hydrido ligand.
- [p-But-calix[4]-(O)4-MoIV], generated in situfrom [MoCl4·THF2] and the alkali salts of p-But-calix[4]arene, displays the reactivity expected for a d2-carbenoid metal. The reaction carried out in the presenceof azobenzene led to the cleavage of the NN bond andthe formation of a dimeric MoVI-phenylimido derivative,[{μ-p-But-calix[4]-(O)4}2{MoVI⋮NPh}2], while the reaction with acetylenes led to 2-metallacyclopropene complexes [{p-But-calix[4]-(O)4-Mo}(η2-C2R2)], which converted to 1-metallacyclopropenes, the precursor of alkylidene and alkylidyne functionalities, in the reaction witha hydride source.
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