Ring-Opening Metathesis Polymerization of Norbornene with Catecholato Complexes of Tungsten(VI) as Effective Catalyst Precursors
Ring-Opening Metathesis Polymerization of Norbornene with Catecholato Complexes of Tungsten(VI) as Effective Catalyst Precursors
复制标题
钨(VI)儿茶酚配合物作为有效催化剂前驱体进行降冰片烯开环易位聚合
DOI:
10.1295/polymj.35.896
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发表时间:
2003
期刊:
影响因子:
2.8
通讯作者:
H. Yasuda
中科院分区:
文献类型:
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作者:
Y. Nakayama;K. Katsuda;H. Yasuda
Catalysis of catecholatotungsten(VI) complexes for the ring-opening metathesis polymerization (ROMP) of norbornene (NBE) and dicyclopentadiene (DCPD) was studied. Bis(catecholato) complex, WCl2(cat)2 (2, cat = catecholato), was found to be particularly active for the ROMP of norbornene in the presence of AlEt3 as a cocatalyst to give polymers with relatively narrow molecular weight distributions. A bulky catecholato complex, WCl2(tBucat)2 (3, tBucat = 3,5-di-tert-butylcatecholato), afforded poly(NBE) with high cis-content. The use of modified methylaluminoxane (MMAO, Type 3A in toluene) as a cocatalyst improved activities at low temperature (-78°C). A mono(catecholato) complex, WCl4(cat) 1, showed high activity for the ROMP of a bulkier monomer, DCPD, to give poly(DCPD) with high cis-content.
DOI:
--
发表时间:
2002
期刊:
J. Organomet. Chem. 654・1-2
影响因子:
--
作者:
Takashima;Y.;Nakayama;Y.;Yasuda;H.;Nakamura;A.;Harada;A.
通讯作者:
A.
DOI:
--
发表时间:
2002
期刊:
J. Organomet. Chem. 651・1-2
影响因子:
--
作者:
Takashima;Y.;Nakayama;Y.;Yasuda;H.;Harada;A.
通讯作者:
A.