Unprecedented isospecific 3,4-polymerization of isoprene by cationic rare earth metal alkyl species resulting from a binuclear precursor

Journal of the American Chemical Society

Volumn 127, Issue 42, 2005, Pages 14562-14563

  Zhang, Lixin ^a   Luo, Yi ^a   Hou, Zhaomin ^a  

^a NONE

Author keywords

[No Author keywords available]

Indexed keywords

ALKYL GROUP; ISOPRENE; LANTHANIDE;

ARTICLE; CATALYSIS; CATALYST; CHEMICAL STRUCTURE; DENSITY FUNCTIONAL THEORY; DIFFERENTIAL SCANNING CALORIMETRY; POLYMERIZATION; PROTON NUCLEAR MAGNETIC RESONANCE; REACTION ANALYSIS; SIGNAL DETECTION; STEREOCHEMISTRY; STRUCTURE ANALYSIS; X RAY DIFFRACTION;

BUTADIENES; CATIONS; HEMITERPENES; METALS, RARE EARTH; MOLECULAR CONFORMATION; ORGANOMETALLIC COMPOUNDS; PENTANES;

EID: 27144431932     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja055397r     Document Type: Article

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35. The decomposition product of the initially formed cationic active species might be active for isoprene polymerization, but its lifetime at room temperature might be very short, and further decomposition to give an inactive species could take place very rapidly. At low temperatures, however, it might survive for a longer time to initiate isoprene polymerization.
36. 13C NMR analysis of the in situ generated cationic Y alkyl species at low temperatures was not successful because of the poor solubility and instability of the organometallic species.