LITHIUM PERCHLORATE CATALYSIS OF THE HETERO-DIELS-ALDER REACTION - A SPECIFIC LITHIUM CATION EFFECT
LITHIUM PERCHLORATE CATALYSIS OF THE HETERO-DIELS-ALDER REACTION - A SPECIFIC LITHIUM CATION EFFECT
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DOI：
10.1016/s0040-4020(01)96181-2
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发表时间：
1991-09-23
期刊：
影响因子：
2.1
通讯作者：
TACCONI, G
中科院分区：
文献类型：
--
作者：
DESIMONI, G;FAITA, G;TACCONI, G
研究了高氯酸锂在5种溶剂中催化1-苯基-4-苄基-5-吡唑酮与乙基乙烯醚的异Diels-Alder反应。反应速率随盐浓度的增加而增加，且反应速率与盐的摩尔分数呈线性关系。所有的相关性都集中在一个值上，这有力地支持了锂离子作为路易斯酸促进催化作用的存在。研究了催化剂与溶剂相互作用的性质。
The lithium perchlorate catalysis of the hetero Diels-Alder reaction between 1-phenyl-4-benzylidene-5-pyrazolone and ethyl vinyl ether was kinetically investigated in five solvents.The rate increases as the salt concentration increases and a linear relationship between the relative rate and the molar fraction of the salt can be obtained.All correlations converge on a single value and this strongly supports the presence of a catalysis promoted by the lithium cation acting as a Lewis acid. The nature of the interaction between the catalyst and the solvent was also investigated.