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Volumn 127, Issue 14, 2005, Pages 5132-5146

Reactions of vinyl acetate and vinyl trifluoroacetate with cationic diimine Pd(II) and Ni(II) alkyl complexes: Identification of problems connected with copolymerizations of these monomers with ethylene

Author keywords

[No Author keywords available]

Indexed keywords

COPOLYMERIZATION; ETHYLENE; MIXTURES; MONOMERS; OLEFINS; POSITIVE IONS; REACTION KINETICS; THERMOANALYSIS;

EID: 17144412147     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja045969s     Document Type: Article
Times cited : (130)

References (48)
  • 3
    • 17144392313 scopus 로고    scopus 로고
    • note
    • - counterions, respectively. In cases where only one of the two salts was prepared, a and b are omitted.
  • 12
    • 17144413501 scopus 로고    scopus 로고
    • note
    • Similar pairs are observed for coordinated propylene, though the rotation cannot be completely frozen out in this case.
  • 17
    • 17144364801 scopus 로고    scopus 로고
    • note
    • ‡ values of 15.6 and 15.9 kcal/mol, respectively.
  • 20
    • 17144408108 scopus 로고    scopus 로고
    • note
    • Because ethylene distribution between the headspace and solution varied with temperature, ethylene concentration at a given temperature was determined by NMR integration.
  • 21
    • 17144423375 scopus 로고    scopus 로고
    • note
    • 3CN may organize the solvent more extensively than free ethylene.
  • 22
    • 17144388004 scopus 로고    scopus 로고
    • note
    • f group to a the beta or gamma position and generates a species with a much lower barrier to insertion. From observations summarized in Scheme 6, this method for insertion from 18 appears feasible, but the beta and gamma species are clearly higher in energy and the overall effect would still be a much higher apparent barrier of 18.
  • 26
    • 17144414262 scopus 로고    scopus 로고
    • note
    • 25 more electron rich olefins inserted more rapidly. In the first and third cases, the overall rates measured were a combination of both a binding constant and an insertion rate.
  • 31
    • 17144381413 scopus 로고    scopus 로고
    • note
    • It should be noted that 19 contains 2.6-diisopropylphenyl groups on the diimine, while the diimine aryls of 4 are 2,6-dimethylphenyl. Typically, differences between rates and equilibria of palladium complexes of varying diimine ligands are small, being on the order of a kcal/mol or less.
  • 46
    • 17144429848 scopus 로고    scopus 로고
    • note
    • 34 and MeLi as per the procedure reported for the synthesis of the analogous Pd complex with 2,6-diisopropyl groups attached to the nitrogen ligand in ref 2.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.