| Enolate chelating N-heterocyclic carbene complexes of Fe(II): Synthesis, structure and their catalytic activity for ring-opening polymerization of ε-caprolactone |
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| 作者姓名： | WANG YongSheng SUN HongMei TAO XuePing SHEN Qi ZHANG Yong |
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| 作者单位： | Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry and Chemical Engineering, Suzhou University, Suzhou 215123, China |
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| 基金项目： | Supported by the National Natural Science Foundation of China (Grant No. 20632040)，the Key Laboratory of Organic Chemistry of Jiangsu Province, China |
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| 摘 要： | The reaction of anhydrous FeBr2 with two equivalents of anionic N-heterocyclic carbene (NaL1 and NaL2), which are generated in situ by the reaction of the corresponding salt 4-R-C6H4COCH2{CH- (NCHCHNiPr)}Br] (R = OCH3, H2L1Br, 1; R = F, H2L2Br, 2) with two equivalents of NaN(SiMe3)2, affords bis-ligand Fe(II) complexes of L12Fe (3) and L22Fe (4) in high yield, respectively. Attempt to synthesize mono-ligand Fe(II) bromide by the 1:1 molar ratio of NaL to FeBr2 is unsuccessful, and the same com- plexes of 3 and 4 were obtained. Both 3 and 4 have been depicted by elemental analysis and X-ray structure determination. Preliminary studies show that both 3 and 4 can be used as single-component catalyst for the ring-opening polymerization of ε-caprolactone, and the catalytic activity of 3 is higher than that of 4.
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| 关 键 词： | iron complex functionalized N-heterocyclic carbene ε-caprolactone ring-opening polymerization |
| 收稿时间： | 2007-03-19 |
| 修稿时间： | 2007-04-22 |
Enolate chelating N-heterocyclic carbene complexes of Fe(II): Synthesis,structure and their catalytic activity for ring-opening polymerization of ɛ-caprolactone |
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| WANG YongSheng SUN HongMei TAO XuePing SHEN Qi ZHANG Yong.Enolate chelating N-heterocyclic carbene complexes of Fe(II): Synthesis,structure and their catalytic activity for ring-opening polymerization of ɛ-caprolactone[J].Chinese Science Bulletin,2007,52(23):3193-3199. |
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| Authors: | Wang YongSheng Sun HongMei Tao XuePing Shen Qi Zhang Yong |
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| Institution: | (1) Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry and Chemical Engineering, Suzhou University, Suzhou, 215123, China |
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| Abstract: | The reaction of anhydrous FeBr2 with two equivalents of anionic N-heterocyclic carbene (NaL1 and NaL2), which are generated in situ by the reaction of the corresponding salt 4-R-C6H4COCH2{CH-(NCHCHNiPr)}Br] (R = OCH3, H2L1Br, 1; R = F, H2L2Br, 2) with two equivalents of NaN(SiMe3)2, affords bis-ligand Fe(II) complexes of L1
2Fe (3) and L2
2Fe (4) in high yield, respectively. Attempt to synthesize mono-ligand Fe(II) bromide by the 1:1 molar ratio of NaL to FeBr2 is unsuccessful, and the same complexes of 3 and 4 were obtained. Both 3 and 4 have been depicted by elemental analysis and
X-ray structure determination. Preliminary studies show that both 3 and 4 can be used as single-component catalyst for the
ring-opening polymerization of ɛ-caprolactone, and the catalytic activity of 3 is higher than that of 4.
Supported by the National Natural Science Foundation of China (Grant No. 20632040) and the Key Laboratory of Organic Chemistry
of Jiangsu Province, China |
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| Keywords: | iron complex functionalized N-heterocyclic carbene ɛ -caprolactone ring-opening polymerization |
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