On the Reaction between Aluminium Triethyl or Triphenyl and Chromium Acetylacetonate

Sartori, G.; Costa, G.

doi:10.1002/bbpc.19590630121

Zeitschrift für Elektrochemie, Berichte der Bunsengesellschaft

1959

DOI: 10.1002/bbpc.19590630121

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On the Reaction between Aluminium Triethyl or Triphenyl and Chromium Acetylacetonate

G. Sartori

G. Costa

Abstract: The stoichiometry of the reactions between Al(C2H5)3 or Al(C2H5)3 and Cr(acac)3 is examined by quantitative determination of gaseous reaction products or unreacted reagents as weel as by conductometric titration. Solid reaction products have been isolated and analyzed. From stoichiometry, magnetic measurements and interpretation of I.R. spectra of reaction solutions and of reaction products a reaction mechanism and the structure of a reaction products is suggested. The reaction products is considered as formed… Show more

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Cited by 5 publications

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Vanadium‐ und Chrom‐Katalysatoren für die Äthylenpolymerisation

Henrici‐Olivé

Olivé

1971

Angewandte Chemie

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Olive und S. Olive"] Dieser Fortschrittsbericht enthalt eine Literaturiibersicht uber losliche Katalysatorsysteme auf der Basis von Vanadium und Chrom, die durch eine kombinierte Untersuchung der magnetischen Eigenschaften und der Polymerisationsaktivitat solcher Systeme ergh'nzt wird. Es zeigt sich, dab Vanadium aktive Spezies mit den Oxidationsstufen V(iii) und V( 11) bildet, Chrom hingegen nur mit CI./ 1 1 ) . Fur den Polymerisationsverlauf werden Modelle vorgeschlagen. ~ Ein Vergleich mit heterogenen Systemen (Phillips-Katalysator) ji2hrt zu einigen allgemeinen Prinzipien iiber die Aktivitat von Katalysatoren und die Eigenschafen der damit hergestellten Polymeren.

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Vanadium‐ und Chrom‐Katalysatoren für die Äthylenpolymerisation

Henrici‐Olivé

Olivé

1971

Angewandte Chemie

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Vanadium and Chromium Catalysts for Polymerization of Ethylene

Henrici‐Olivé¹,

Olivé²

1971

Angew. Chem. Int. Ed. Engl.

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In the present progress report literature data concerning homogeneous catalyst systems based on vanadium and chromium are reviewed and complemented by a combined study of the magnetic properties and the polymerization activity of such systems. The results show that vanadium forms active species as V ( I I I ) and as V ( I I ) , but chromium only as Cr ( I I ) ; models are suggested for the polymerization process.-A comparison with heterogeneous systems (Phillips catalyst) allows the establishment of some general principles concerning the activity of the catalyst and the properties of the polymers.Angew. Chem. internat. Edit. Vol. 10 (1971) / No. I I

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A new catalyst system for the polymerization of epoxides

Kambara

Takahashi

1963

Makromol. Chem.

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Various epoxides such as ethylene oxide, propylene oxide, epichlorohydrin, isobutylene oxide, f-chloromethyl propylene oxide, styrene oxide, and phenylglycidyl ether, can be polymerized to high molecular weight, crystalline polymers with catalyst systems of AlEt,/transition-metal chelate compound.Poly(propy1ene oxide) having an intrinsic viscosity up to 11 was obtained by AlEt,/ bis(dimethylglyoximo)nickel(II). Crystalline poly(epichlorohydrin), poly(styrene oxide), poly(phenylglycidy1 ether) with high molecular weights were formed. The last polymer is insoluble in common solvents a t room temperature and can be converted to a strong fiber and a tough film. I n addition, the polymerization mechanism by a coordinate propagation process is discussed. ZUSAMMENFASSUNG:Verschiedene Epoxyde, wie Athylenoxyd, Propylenoxyd, Epichlorhydrin, Isobutylenoxyd, 2-Chlormethylpropylenoxyd, Styroloxyd und Phenylglycidyliither konnen mit katalytischen Systemen aus AlEt, und Chelaten von tfbergangsmetallen zu kristallinen Produkten mit hohem Molekulargewicht polymerisiert werden.Polypropylenoxyd mit [q]-Werten bis zu 11 wurde mit AlEt,/bis(Dimethylglyoximo)nickel(I1) erhalten. Kristallines Polyepiehlorhydrin, Polystyroloxyd und Polyphenylglycidylather mit hohen Molekulargewichten wurden gebildet. Das letzte Polymere ist bei Zimmertemperatur in den iiblichen Losungsmitteln unloslich und kann zu einer starken Faser oder zu einem zahen Film geformt werden.Weiterhin wird der Mechanismus der Polymerisation als koordinativer Wachstumsvorgang diskutiert.

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On the Reaction between Aluminium Triethyl or Triphenyl and Chromium Acetylacetonate

Cited by 5 publications

References 4 publications

Vanadium‐ und Chrom‐Katalysatoren für die Äthylenpolymerisation

Vanadium‐ und Chrom‐Katalysatoren für die Äthylenpolymerisation

Vanadium and Chromium Catalysts for Polymerization of Ethylene

A new catalyst system for the polymerization of epoxides

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