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Stoichiometric Homo‐Aldol Coupling of Acetone, Cyclohexanone, and Acetophenone by the [(η 5 ‐Cp R )Co] (R = Me 5 , 1,2,4‐tri‐ tert ‐butyl) Moiety
Author(s) -
Schneider Jörg J.,
Wolf Dirk,
Bläser Dieter,
Boese Roland
Publication year - 2000
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/(sici)1099-0682(200004)2000:4<713::aid-ejic713>3.0.co;2-a
Subject(s) - chemistry , cyclohexanone , acetophenone , benzophenone , ketone , toluene , aldol reaction , acetone , moiety , medicinal chemistry , photochemistry , organic chemistry , catalysis
Acetone, cyclohexanone, and acetophenone react with the toluene‐bridged triple‐decker complexes [{(η 5 ‐Cp R )Co} 2 ‐μ‐(η 4 :η 4 ‐toluene)] (R = Me 5 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 C sp3 –H activation step of the ketones by 14 e – [(η 5 ‐Cp R )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 C sp3 –H activation occurs. In agreement with this, benzophenone does not react with complex 3 .