One-Pot Synthesis of 2,6-Di-<i>t</i>-butyl- and 2,6-Diarylthiopyrylium Perchlorates
作者:Giancarlo Doddi、Gianfranco Ercolani
DOI:10.1055/s-1985-31351
日期:——
The title compounds were prepared by reaction of the corresponding methyl ketone with an excess of triethyl orthoformate in an acidic medium (acetic anhydride/perchloric acid) under a hydrogen sulfide stream.
Rates and equilibria of the methoxide attachment to 2,6-di-tert-butyl-4-arylthiopyrylium cations. Can ion pair formation be rate determining in anion-cation combination reactions?
作者:M. L. Di Vona、G. Doddi、G. Ercolani、G. Illuminati
DOI:10.1021/ja00272a041
日期:1986.6
combination of the nucleophile with the cations to give the adducts, thus disproving the views indicating the ion pair formation as the rate-determing step in anion-cation combination reactions. Moreover the experimental data clearly indicate that the Leffler-Hammond postulate cannot be held valid for this class of reactions. The different selectivity observed for the methoxide attachment to the CY and y positions