- A method for the production of sulfate or sulfonate esters
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The present invention relates to method for the production of sulfate or sulfonate esters essentially comprising the steps of adding sulfuric acid or sulfonic acid to boron acid in a medium with or without solvent (121), stirring the prepared mixture 8122), removing the precipitated boric acid (123), removing the solvent in case the solvent is used (124), producing dialkyl sulfate esters, mono alkyl sulfate esters and sulfonate esters of alkali metal salts (125), and based on the acidolysis of boron esters obtained from alcohol and boric acid with sulfuric acid or sulfonic acid.
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Paragraph 0036
(2015/03/31)
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- Aliphatic thioethers by s-alkylation of thiols via trialkyl borates
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A simple and convenient one-pot procedure is described for the synthesis of thioethers via boron esters. This procedure involves in-situ generation of alkyl sulfates by reaction of trialkyl borates with concentrated sulfuric acid and subsequent reaction with thiols in the presence of pyridine. The reactions with boron esters of primary or secondary alcohols proceed cleanly at 100C and afford aliphatic thioethers in reasonable yields (59-93%) within 24 h. Interestingly, the 1H NMR spectra of the products showed no sign of positional isomerisms. The method fails however with thiophenol and does not yield aromatic thioethers, due to electrophilic substitution at the phenyl ring. Copyright Taylor & Francis Group, LLC.
- Gunes, Deniz,Sirkecioglu, Okan,Bicak, Niyazi
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p. 1685 - 1690
(2010/09/17)
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