22829-72-7Relevant academic research and scientific papers
Hex-1-ene hydroformylation catalyzed by Rh(acac)2 modified with amines, formation of reactive HRh(CO)3 und unreactive Rh4(CO)84 species
Trzeciak, A. M.
, p. 105 - 111 (1990)
Pyridines and amines have been used as modifying ligands in the hex-1-ene hydroformylation reaction catalyzed by Rh(acac)2.Aldehydes (n + iso) were obtained in 80-85 percent yield.The active form of the catalyst has been isolated as the solid HRh(CO)3.Another complex formed in the reaction of Rh(acac)2 with H2 and CO in the presence of pyridine, Rh4(CO)84, is catalytically inactive.
1,5-Hexadiene selective hydroformylation reaction catalyzed with Rh(acac)2/P(OPh)3 and Rh(acac)(CO)(PPh3)/PPh3 complexes
Trzeciak, A.M.,Ziolkowski, J.J.
, p. 107 - 112 (2007/10/02)
Hydroformylation of 1,5-hexadiene, catalyzed by the system Rh(acac)2/P(OPh)3 (I), leads to the formation of mono- and dialdehydes, 4-heptenal, 2-Me-3-hexenal and octane-1,8-dial, 2,5-Me2-hexanedial respectively.The yield of dialdehydes increases with temperature and pressure and reaches 100percent at 80 deg C and 10 atm of CO/H2 = 1.The reaction catalyzed by Rh(acac)(CO)(PPh3)/PPh3 (II) system produces, besides dialdehydes, monoaldehydes with a terminal double bond, namely 6-heptenal and 2-Me-5-hexenal.The migration of the double bonds in monoaldehydes dependsmainly on the donor properties of modifying ligands.Phosphine when used as a modifying ligand (II), because of its strong donor properties, restricts isomerization (double bond migration) and diminishes yield of 4-heptenal.In contrast, when less strongly donating ligands such as phosphite are used as modifying ligands (I), independently of its steric properties, 4-heptenal is the main reaction product.Key words: Hydroformylation; Rhodium; Hexadiene; Catalysis
