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Stoichiometric Homo-Aldol Coupling of Acetone, Cyclohexanone, and Acetophenone by the [(η5-CpR)Co] (R = Me5, 1,2,4-tri-tert-butyl) Moiety (2000)

Schneider, Jörg J. ; Wolf, Dirk ; Bläser, Dieter ; [weitere]

Weinheim : Wiley-Blackwell

Berichte der deutschen chemischen Gesellschaft 2000 (2000), S. 713-718

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Details

ISSN: 1434-1948

Schlagwort(e): Cobalt ; Sandwich complexes ; Aldol reactions ; Ketones ; C-H activation ; Chemistry ; General Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Acetone, cyclohexanone, and acetophenone react with the toluene-bridged triple-decker complexes [{(η5-CpR)Co}2-μ-(η4:η4-toluene)] (R = Me5 3; 1,2,4-tri-tert-butyl 4) by toluene substitution and homo-aldol coupling of two ketone molecules to form the first oxadiene cobalt complexes. These reactions may involve a Csp3-H activation step of the ketones by 14 e- [(η5-CpR)Co] fragments generated from the triple-decker complexes 3 and 4. If no acidic protons are present in the position α to the carbonyl carbon position in the ketone, no Csp3-H activation occurs. In agreement with this, benzophenone does not react with complex 3.

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

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