Alkylchlorotins grafted to cross-linked polystyrene beads by a -(CH2)n- spacer (n=4, 6, 11): selective, clean and recyclable catalysts for transesterification reactions.
Alkylchlorotins grafted to cross-linked polystyrene beads by a -(CH2)n- spacer (n=4, 6, 11): selective, clean and recyclable catalysts for transesterification reactions.
复制标题
通过 -(CH2)n- 间隔基（n=4、6、11）接枝到交联聚苯乙烯珠上的烷基氯锡：用于酯交换反应的选择性、清洁且可回收的催化剂。
作者：
Carlos Camacho;M. Biesemans,;Manu Van Poeck;F. Mercier;R. Willem,;Karine Darriet;B. Jousseaume;T. Toupance;U. Schneider;U. Gerigk
Insoluble polystyrene grafted compounds of the type (P-H)(1-t){P-(CH2)n SnBu(p)Cl(3-p)}(t), (P-H)(1-t){P-(CH2)n SnBuO}(t) and (P-H)(1-t)[{P-(CH2)n SnBuCl}2O](t/2), in which (P-H) is a cross-linked polystyrene; n=4, 6, and 11; p=0 and 1; and t the degree of functionalisation, were synthesised from Amberlite XE-305, a polystyrene cross-linked with divinylbenzene. The compounds were characterised by using elemental analysis, and IR, Raman, solid-state 117Sn NMR, and 1H and 119Sn high-resolution MAS NMR spectroscopy. The influence of the spacer length and the tin functionality on the catalytic activity of these compounds, as well as their recycling ability, was assessed in the transesterification reaction of ethyl acetate with various alcohols. These studies showed significant differences in the activity of the catalysts interpreted in terms of changes in the mobility of the catalytic centres. Some of the supported catalysts could be recycled at least seven times without noticeable loss of activity. The residual tin content in the reaction products was found to be as low as 3 ppm.
DOI：
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发表时间：
2002
期刊：
Angew. Chem. Int. Ed. 42
影响因子：
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作者：
J.Xiang;A.Orita;J.Otera
通讯作者：
J.Otera