Olefin Polymerization by Vanadium-Containing Polyhedral Oligometallasilsesquioxanes

Journal of the American Chemical Society

Volumn 113, Issue 9, 1991, Pages 3618-3619

  Feher, Frank J ^a   Walzer, John F ^a   Blanski, Rusty L ^a  

^a UNIVERSITY OF CALIFORNIA   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0000932404     PISSN: 00027863     EISSN: 15205126     Source Type: Journal    
DOI: 10.1021/ja00009a073     Document Type: Article

References (43)

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24. Except were indicated, each polymerization reaction reported in this paper was performed by the addition of Me3Al (1.03 M in toluene) to 2 (35 mg, 0.0337 mmol) in 10-50 mL of solvent. Reactions were quenched by the addition of excess 2-propanol/hexane. The crude polymers were stirred overnight in 2-propanol/hexane and then collected by filtration or decantation and dried in vacuo (~60 °C, 10-5 Torr, 1-2 days). Evaporation of the 2-propanol/ hexane washes typically afforded silsesquioxane residues, but small amounts of oily polymers or oligomers were obtained from the reactions with propylene.
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38. 3b. In many instances, serious questions can be raised regarding the apparent homogeneity of the catalyst.
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43. A referee has suggested that a V(IV) species might be the active catalyst. This is clearly a reasonable hypothesis, but we have prepared [(c-C6 H11)7 Si7 O12 V(CH2 SiMe3)] and found that it does not initiate ethylene polymerization. The synthesis of this complex and the results from our other efforts to elucidate the identity of the polymerization catalyst(s) will be reported in a subsequent article.