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7748838 
Journal Article 
LITHIUM PERCHLORATE CATALYSIS OF THE HETERO-DIELS-ALDER REACTION - A SPECIFIC LITHIUM CATION EFFECT 
Desimoni, G; Faita, G; Righetti, PP; Tacconi, G 
1991 
1 
Tetrahedron
ISSN: 0040-4020 
47 
39 
8399-8406 
English 
WOS:A1991GL19000009 
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. © 1991. 
LITHIUM PERCHLORATE; SOLVENTS; CATALYSIS; DIELS-ALDER REACTION