New Prospects in Homogeneous Ring-Opening Polymerization of Heterocyclic Monomers

Teyssié, Ph.; Bioul, J. P.; Hamitou, A.; Heuschen, J.; Hocks, L.; Jérôme, Robert; Ouhadi, T.

doi:10.1021/bk-1977-0059.ch012

Cited by 16 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The exception is that benzyl glycidyl ether (4) has a slower polymerization rate. The significance of the electronic considerations suggests that, for this catalyst, an anionic-like propagation mechanism takes place [16][17][18] Only an oligomeric fraction was obtained. alysts in which a more cationic-like propagation mechanism has been described 19,20) .…”

Section: Resultsmentioning

confidence: 93%

Ring-opening polymerization of glycidylic compounds: influence of the glycidylic oxygen in the coordinative mechanism

Ronda¹,

Serra

Cádiz

1999

Macromol. Chem. Phys.

View full text Add to dashboard Cite

A series of oxiranic monomers was synthesized and polymerized by four of the most common aluminium-based coordinative initiators: (C 2 H 5 ) 3 Al/H 2 O (mole ratio 1 : 0.6) named Vandenberg catalyst, (C 2 H 5 ) 3 Al/CH 3 COCH 2 COCH 3 /H 2 O (mole ratio 1 : 1 : 0.5) named Vandenberg chelate catalyst, (i-PrO) 2 Al1O1Zn1O1Al(i-PrO) 2 named Teyssié catalyst and (i-PrO) 3 Al/ZnCl 2 (mole ratio 1 : 0.5) named Price catalyst. They all have a different Lewis acid character. The influence of a second oxygen (glycidylic or not) on the characteristics of the polymers and conversions was studied and rationalized on the basis of a coordinative mechanism. The differences in the polymerization rate and regioregularity of the polymers obtained are related to the electronic and coordination effects of the neighbouring oxirane substituents. The new polymers were also thermally characterized.

show abstract

Section: Resultsmentioning

confidence: 93%

Ring-opening polymerization of glycidylic compounds: influence of the glycidylic oxygen in the coordinative mechanism

Ronda¹,

Serra

Cádiz

1999

Macromol. Chem. Phys.

View full text Add to dashboard Cite

show abstract

“…With these starting materials, Ca, Mg, Mn, Co, Fe and Zn bimetallic m-oxo alkoxides, M[OAl(OPr i ) 2 ] 2 , were prepared as described in the literature. [11][12][13][14][15][16] Sample characterization X-Ray diffraction. The synthesized and heat-treated samples were analyzed by X-ray diffraction (XRD) on a Scintag XDS-200 instrument, using Cu-Ka radiation set at a voltage of 40 kV and a current of 40 mA.…”

Section: Experimental Starting Materialsmentioning

confidence: 99%

High surface area homogeneous nanocrystalline bimetallic oxides obtained by hydrolysis of bimetallic µ-oxo alkoxides

et al. 2003

View full text Add to dashboard Cite

“…104-54-1 cinnamyl alcohol 30 0.015 18.00 50 rt 3-phenyl-1-propanol (20) 122-97-4 rt methylcyclohexane (15) 108-87-2 should be considered in interpreting this data: bead swelling and the role of solvation during the course of hydrogenation.…”

Section: Resultsmentioning

confidence: 99%

“…This change was particularly vivid when the powdered support was used. The black powder caused a very rapid hydrogenation of benzene for about 20 min, then virtually all activity ceased. Termination of the experiment, followed by filtration, revealed that the rhodium had separated from the white support, but the properly prepared beads to not lose their color even after many hours of catalytic activity and, in fact, they become darker.…”

Section: Phch2n=chphmentioning

confidence: 99%

Versatile polymer-bound hydrogenation catalysts. Rhodium(I)-catalyzed hydrogenation

HOLY¹

1979

J. Org. Chem.

View full text Add to dashboard Cite

The bidentate ligand anthranilic acid has been anchored to polystyrene beads (Amberlite XAD-4) and the Rh(1) complex has been prepared. The polymer is a hydrogenation catalyst of exceptional activity, long-term stability, and considerable insensitivity to poisoning. Hundreds of catalytic cycles per metal atom are demonstrated without substantial loss of activity. The rhodium catalyst reduces a variety of olefinic and aromatic hydrocarbons and carbonyl, nitrile, and nitro functional groups. Catalytic activity depends upon retention of beads; if fragmentation occurs, the activity is considerably diminished. ESCA studies clearly demonstrate the rhodium to have a +1 formal oxidation sr;ate.Anchoring ligands to insoluble polymeric supports, followed by complexation with transition metals, results in polymers having catalytic p~t e n t i a l . l -~ These metal complexes, hybrids of homogeneous and heterogeneous approaches, are attractice because they often permit the activity of soluble catalysts and the ease of product separation inherent in heterogenecus catalysts. In referring to this class of catalysts the names "polymer bound", "hybrid phase", or "supported" are common.The choice of the ligand to be anchored is usually based on attempts to create environments analogous to those in the most active homogeneous catalysts. Because of the preponderance of phosphine complexes in homogeneous catalysts, most polymer-bound catalysts to date have involved these

show abstract

New Prospects in Homogeneous Ring-Opening Polymerization of Heterocyclic Monomers

Cited by 16 publications

References 0 publications

Ring-opening polymerization of glycidylic compounds: influence of the glycidylic oxygen in the coordinative mechanism

Ring-opening polymerization of glycidylic compounds: influence of the glycidylic oxygen in the coordinative mechanism

High surface area homogeneous nanocrystalline bimetallic oxides obtained by hydrolysis of bimetallic µ-oxo alkoxides

Versatile polymer-bound hydrogenation catalysts. Rhodium(I)-catalyzed hydrogenation

Contact Info

Product

Resources

About