Stabilization of Highly Electrophilic Allenes by Coordination with Manganese. Synthesis of 1-Functionalized Dicarbonyl (η-Methylcyclopentadienyl) (1-2η-3-Formylallene) Manganese Complexes.

Abstract
By treatment with carbonyl electrophiles, the carbanion of methoxybutenyne leads to electrophilic enynes. These are cleanly transformed into stable complexes of 1-functionalized 3-formyl allenes after coordination to dicarbonyl (η-methylcyclopentadienyl) manganese and deprotection-isomerization with diluted acetic acid. The exo-allene dialdehyde manganese complex was characterized by X-ray analysis.

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