36645-11-1Relevant academic research and scientific papers
Organic Syntheses via Transition Metal Complexes, 18. - A Novel Type of Carbonyl Olefination by Means of Allenes via a Template-Induced Formation of (Trimethylenemethane)tricarbonyliron Complexes
Aumann, Rudolf,Melchers, Hans-Dieter,Weidenhaupt, Hermann-Josef
, p. 17 - 22 (2007/10/02)
On photolysis in the presence of Fe(Co)5 allenes and aldehydes give (trimethylenemethane)tricarbonyliron complexes 5 and 5'.The reaction is highly stereospecific and involves the intermediate formation of ?-allyl-?-complexes, which spontaneously eliminate CO2 to give 5 and 5'.To our knowledge, this is the first example of a carbonyl olefination by means of a quarternary carbon of a cumulene.The trimethylenemethane ligand of 5 may be isomerised at 180 deg C without decomposition via rotation of substituents around the C=C bonds.
