In Situ Formation of Bis(phosphinimino)methanide Rare Earth Alkoxide Initiators for the Ring-Opening Polymerization of e-Caprolactone
GUILLAUME, Sophie M.
Team 1 LCPO : Polymerization Catalyses & Engineering
Laboratoire de Chimie des polymères organiques [LCPO]
< Reduce
Team 1 LCPO : Polymerization Catalyses & Engineering
Laboratoire de Chimie des polymères organiques [LCPO]
Language
en
Article de revue
This item was published in
Organometallics. 2007, vol. 26, n° 3, p. 651-657
American Chemical Society
English Abstract
series of pentamethylcyclopentadienyl bis(phosphinimino)methanide complexes of yttrium and the lanthanides, [{CH(PPh2NSiMe3)2}Ln(h5-C5Me5)Cl] (Ln = Y (1a), Sm (1b), Yb (1c)), were prepd. by two different synthetic approaches. ...Read more >
series of pentamethylcyclopentadienyl bis(phosphinimino)methanide complexes of yttrium and the lanthanides, [{CH(PPh2NSiMe3)2}Ln(h5-C5Me5)Cl] (Ln = Y (1a), Sm (1b), Yb (1c)), were prepd. by two different synthetic approaches. The compds. can be obtained either from [{CH(PPh2NSiMe3)2}LnCl2]2 (Ln = Y, Sm, Yb) and K(C5Me5) or in a one-pot reaction when K{CH(PPh2NSiMe3)2} is reacted with anhyd. rare earth trichlorides in the presence of K(C5Me5). When 1a-c were combined in situ with 1 equiv. of 2-propanol, an active [Ln]-OiPr initiator was formed that enabled the pseudo-living ring-opening polymn. of e-caprolactone to polymers with controlled mol. features (end groups, .hivin.Mn) and very narrow molar mass distributions.Read less <
English Keywords
prepn. of bis(phosphinimino)methanide rare earth alkoxide initiators for ring-opening polymn. of caprolactone)
Polymerization
Polymerization catalysts (ring-opening
Crystal structure
Molecular structure (of bis(phosphinimino)methanide pentamethylcyclopentadienyl yttrium
samarium
and ytterbium chloro complexes)
Origin
Hal imported