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Stabilization of Highly Electrophilic Allenes by Coordination with Manganese.Synthesis of 1-Functionalized Dicarbonyl(ηmethylcyclopentadienyl)(1-2η-3-formylallene)manganese Complexes.-The complexes (III) mentioned in the title are obtained from the carbonyl substituted ω-methoxyalkenynes (I) upon treatment with the manganese complex (II). The "exo"-isomer with the aldehyde group and the ligand on different sides of the 3,4-double bond predominates in the product mixture.- (FRANCK-NEUMANN, M.; NEFF, D.; NOUALI, H.; MARTINA, D.; DE CIAN, A.; Synlett (1994) 8, 657-659; Lab. Chim. Org. Synth., Ass. CNRS, Inst. Chim., Univ. L. Pasteur, 67008 Strasbourg, Fr.; EN)