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Metal ion effects on the rate of intramolecular O-alkylation of the anion of ethyl(3-chloropropyl)acetoacetate

โœ Scribed by Roberta Cacciapaglia; Luigi Mandolini


Publisher
Elsevier Science
Year
1990
Tongue
French
Weight
683 KB
Volume
46
Category
Article
ISSN
0040-4020

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โœฆ Synopsis


retarding effect of alkali metal and alkaline-earth metal ions on the rate of intramolecular 0-alkylation of the title compound has been thoroughly investigated in 99% aqueous Me2SO at 25-C. Rate data have been dissected into contributions of free ions (ki) and ion pairs (k. ). Xl

Comparison of the present results with available data for intramole lar C-alkylation of a strictly related system, reveals that rate-depressing effects due to cation pairing turn out to be remarkably similar in the two processes, which is at variance with the expectation of a more pronounced cation dependence of the kidki ratios for 0-alkylation than for C-alkylation.


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