ISL OpenIR  > 青海盐湖研究所知识仓储
Titanium and zirconium amido complexes supported by imidazole-containingligands: syntheses, characterization and catalytic activities
Zhao, Yang; Lin, Miaoshui; Chen, Zhou; Pei, Hao; Li, Yahong; Chen, Yanmei; Wang, Xiufang; Li, Lei; Cao, Yanyuan; Zhang, Yong; Li, Wu
2012
Source PublicationRSC ADVANCES
ISSN2046-2069
Volume2Issue:1Pages:144-150
AbstractA series of new titanium and zirconium amido complexes, incorporating 4,5-diphenyl-2-(2-pyridinyl)-1H-imidazole (HL1), 4,5-bis(4-chlorophenyl)-2-(2-pyridinyl)-1H-imidazole (HL2), 4,5-bis(4-methoxyphenyl)-2-(2-pyridinyl)-1H-imidazole (HL3) and 4,5-bis(2-methoxyphenyl)-2-(2-pyridinyl)-1H-imidazole) (HL4) as the ancillary ligands, have been prepared and are shown to be pre-catalysts for the hydroamination of alkynes. Treatment of Ti(NMe2)(4) with 1 equivalent of HL1, HL2, HL3 and HL4, respectively, results in transamination with one dimethylamide group providing Ti(L1)(NMe2)(3) (1), Ti(L-2)(NMe2)(3) (2), Ti(L3)(NMe2)(3) (3), and Ti(L4)(NMe2)(3)center dot THF (4 center dot THF). Reaction of Ti(NMe2)(4) with 2 equivalents of HL1, HL2, HL3 and HL4, respectively, leads to production of titanium bisamido complexes Ti(L1)(2)(NMe2)(2 center dot)THF(5 center dot THF), Ti(L2)(2)(NMe2)(2)center dot THF (6 center dot THF), Ti(L3)(2)(NMe2)(2)center dot THF (7 center dot THF), and Ti(L-4)(2)(NMe2)(2) (8). Similarly, complexes Zr(L1)(NMe2)(3) (9), Zr(L1)(2)(NMe2)(2)center dot 1.5THF (10 center dot 1.5THF), Zr(L2)(2)(NMe2)(2)center dot 0.5THF (11 center dot 0.5THF), and Zr(L3)(2)(NMe2)(2)center dot 0.5THF (12 center dot 0.5THF) are generated by addition of 1 or 2 equivalents of the corresponding ligands to Zr(NMe2)(4). All compounds have been characterized by elemental and spectroscopic analyses. The solid-state structures of compounds 2 and 6 center dot THF have been further established by single X-ray diffraction analyses. The catalytic activities of 2 and 6 center dot THF towards the hydroamination of alkynes were explored. Complexes 2 and 6 center dot THF were found to be active pre-catalysts for the hydroamination reactions. Complex 2 showed higher catalytic activity and gave highly Markovnikov selective hydroamination of terminal alkynes. A series of new titanium and zirconium amido complexes, incorporating 4,5-diphenyl-2-(2-pyridinyl)-1H-imidazole (HL1), 4,5-bis(4-chlorophenyl)-2-(2-pyridinyl)-1H-imidazole (HL2), 4,5-bis(4-methoxyphenyl)-2-(2-pyridinyl)-1H-imidazole (HL3) and 4,5-bis(2-methoxyphenyl)-2-(2-pyridinyl)-1H-imidazole) (HL4) as the ancillary ligands, have been prepared and are shown to be pre-catalysts for the hydroamination of alkynes. Treatment of Ti(NMe2)(4) with 1 equivalent of HL1, HL2, HL3 and HL4, respectively, results in transamination with one dimethylamide group providing Ti(L1)(NMe2)(3) (1), Ti(L-2)(NMe2)(3) (2), Ti(L3)(NMe2)(3) (3), and Ti(L4)(NMe2)(3)center dot THF (4 center dot THF). Reaction of Ti(NMe2)(4) with 2 equivalents of HL1, HL2, HL3 and HL4, respectively, leads to production of titanium bisamido complexes Ti(L1)(2)(NMe2)(2 center dot)THF(5 center dot THF), Ti(L2)(2)(NMe2)(2)center dot THF (6 center dot THF), Ti(L3)(2)(NMe2)(2)center dot THF (7 center dot THF), and Ti(L-4)(2)(NMe2)(2) (8). Similarly, complexes Zr(L1)(NMe2)(3) (9), Zr(L1)(2)(NMe2)(2)center dot 1.5THF (10 center dot 1.5THF), Zr(L2)(2)(NMe2)(2)center dot 0.5THF (11 center dot 0.5THF), and Zr(L3)(2)(NMe2)(2)center dot 0.5THF (12 center dot 0.5THF) are generated by addition of 1 or 2 equivalents of the corresponding ligands to Zr(NMe2)(4). All compounds have been characterized by elemental and spectroscopic analyses. The solid-state structures of compounds 2 and 6 center dot THF have been further established by single X-ray diffraction analyses. The catalytic activities of 2 and 6 center dot THF towards the hydroamination of alkynes were explored. Complexes 2 and 6 center dot THF were found to be active pre-catalysts for the hydroamination reactions. Complex 2 showed higher catalytic activity and gave highly Markovnikov selective hydroamination of terminal alkynes.
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.isl.ac.cn/handle/363002/2083
Collection青海盐湖研究所知识仓储
Recommended Citation
GB/T 7714
Zhao, Yang,Lin, Miaoshui,Chen, Zhou,et al. Titanium and zirconium amido complexes supported by imidazole-containingligands: syntheses, characterization and catalytic activities[J]. RSC ADVANCES,2012,2(1):144-150.
APA Zhao, Yang.,Lin, Miaoshui.,Chen, Zhou.,Pei, Hao.,Li, Yahong.,...&Li, Wu.(2012).Titanium and zirconium amido complexes supported by imidazole-containingligands: syntheses, characterization and catalytic activities.RSC ADVANCES,2(1),144-150.
MLA Zhao, Yang,et al."Titanium and zirconium amido complexes supported by imidazole-containingligands: syntheses, characterization and catalytic activities".RSC ADVANCES 2.1(2012):144-150.
Files in This Item:
File Name/Size DocType Version Access License
C1RA00408E[1].pdf(444KB) 开放获取CC BY-NC-SAView Application Full Text
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Zhao, Yang]'s Articles
[Lin, Miaoshui]'s Articles
[Chen, Zhou]'s Articles
Baidu academic
Similar articles in Baidu academic
[Zhao, Yang]'s Articles
[Lin, Miaoshui]'s Articles
[Chen, Zhou]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Zhao, Yang]'s Articles
[Lin, Miaoshui]'s Articles
[Chen, Zhou]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: C1RA00408E[1].pdf
Format: Adobe PDF
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.