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Volumn 39, Issue 20, 2006, Pages 6811-6816

Discrete lanthanide aryl(alk)oxide trimethylaluminum adducts as isoprene polymerization catalysts

Author keywords

[No Author keywords available]

Indexed keywords

ALKYLATION; CATALYSIS; INITIATORS (CHEMICAL); MOLECULAR WEIGHT DISTRIBUTION; ORGANOMETALLICS; POLYMERIZATION;

EID: 33750323581     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma061149j     Document Type: Article
Times cited : (77)

References (57)
  • 1
    • 0038401605 scopus 로고
    • Oschneidner, K. A., Jr., Fleming, L., Eds.; Elsevier Science Publishers: Dordrecht, The Netherlands, ; Chapter 61
    • (a) Shen, Z.; Ouyang, J. In Handbook on the Physics and Chemistry of Rare Earths; Oschneidner, K. A., Jr., Fleming, L., Eds.; Elsevier Science Publishers: Dordrecht, The Netherlands, 1987; Chapter 61.
    • (1987) Handbook on the Physics and Chemistry of Rare Earths
    • Shen, Z.1    Ouyang, J.2
  • 4
    • 33750376631 scopus 로고    scopus 로고
    • note
    • To enable polymerization reactions in aliphatic hydrocarbons such as hexane, cyclohexane, and heptane industrially applied catalytic systems are based on Nd(III) precursors with branched or cyclic aliphatic groups that contain eight or more carbon atoms. For example, there are neodymium versatate (isomeric mixture of α,α-disubstituted decanoic carboxylates), neodymium naphthenate (isomeric mixture of substituted cyclopentyl and cyclohexyl carboxylates), and neodymium bis(2-ethylhexyl)phosphate.
  • 21
    • 0001722306 scopus 로고
    • Ln aryl(alk)oxide complexes display efficient single-component polymerization initiators for the ring-opening polymerization of lactones and L-lactide; for examples, see: (a) McLain, S. J.; Drysdale, N. E. Polym. Prepr. (Am. Chem. Soc., Div. Polym. Chem.) 1992, 33, 174-175.
    • (1992) Polym. Prepr. (Am. Chem. Soc., Div. Polym. Chem.) , vol.33 , pp. 174-175
    • McLain, S.J.1    Drysdale, N.E.2
  • 25
    • 0036603973 scopus 로고    scopus 로고
    • Compared to the numerous reports on carboxylate based systems, considerably less work on aryl(alk)oxides was published. For recent examples, see: (a) Dong, W.; Masuda, T. J. Polym. Sci., Part A: Polym. Chem. 2002, 40, 1838-1844.
    • (2002) J. Polym. Sci., Part A: Polym. Chem. , vol.40 , pp. 1838-1844
    • Dong, W.1    Masuda, T.2
  • 31
    • 33750380954 scopus 로고    scopus 로고
    • note
    • 4)] via aryloxide → alkyl exchange; see ref 13.
  • 32
    • 33750308079 scopus 로고    scopus 로고
    • note
    • int = 0.084) [7694 observed reflections (I > 2σ(I)]. R1 = 0.0557, wR2 = 0.0795, GooF = 0.977. All hydrogen atoms except those of the bridging methyl groups C1 and C2 were placed in idealized calculated positions and included in the structure factor calculation but not refined (riding model). The hydrogen atoms at C1 and C2 were located in the difference Fourier map and refined freely.
  • 35
    • 33750284341 scopus 로고    scopus 로고
    • note
    • Due to the intrinsic size effect within the group 3 and lanthanide metals (lanthanide contraction) all of the Nd-O and Nd-C bonds are slightly longer compared to the yttrium and samarium derivatives with smaller metal centers, and slightly shorter compared to the lanthanum derivative with a larger metal center.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.