Molecular Structure of a Hydridoniobocene Complex [Nb(η5-C5H4SiMe3)2(H)3] and Its Use as Catalyst for the Ring-Opening Polymerization of Cyclic Esters

被引：12
作者：
Alonso-Moreno, Carlos [2 ]
Antinolo, Antonio [1 ]
Garcia-Martinez, Joaquin C. [2 ]
Garcia-Yuste, Santiago [1 ]
Lopez-Solera, Isabel [1 ]
Otero, Antonio [1 ]
Perez-Flores, Juan C. [1 ]
Tercero-Morales, Maria T. [1 ]
机构：
[1] Univ Castilla La Mancha, Fac Ciencias Quim, Dept Quim Inorgan Organ & Bioquim, E-13071 Ciudad Real, Spain
[2] Univ Castilla La Mancha, Fac Farm, Dept Quim Inorgan Organ & Bioquim, Albacete 02071, Spain
来源：
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY | 2012年 / 07期
关键词：
Metallocenes; Ring-opening polymerization; Hydride ligands; Niobium; Lactones; SINGLE-SITE CATALYSTS; SPECTROSCOPIC PROPERTIES; ZINC; TRIHYDRIDE; REACTIVITY; CHEMISTRY; NIOBIUM; LACTIDE;
D O I：
10.1002/ejic.201101263
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The second polyhydridoniobocene complex that was characterized by X-ray diffraction is reported. On the basis of H-H distances and H-Nb-H angles, [Nb(eta(5)-C5H4SiMe3)(2)(H)(3)] (1) is classified as a "compressed hydride". Compound 1 acts as an efficient single-component initiator for the ring-opening polymerization of epsilon-caprolactone and delta-valerolactone. epsilon-Caprolactone and delta-valerolactone are both polymerized within a few hours to yield high-to-medium-molecular-weight polymers with medium to broad polydispersities. Polymer end-group analysis showed that the polymerization proceeds through a coordination-insertion mechanism based on the cleavage of the ring between the oxygen atom and the acyl carbon atom.
引用
收藏
页码：1139 / 1144
页数：6
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