66202-89-9Relevant articles and documents
Process for oxidizing thallium (I) to thallium (III)
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, (2008/06/13)
Thallium (l) alkanoate salts are oxidized to thallium (lll) salts in a liquid medium with a peroganic carboxylic acid in the presence of a reactive form of manganese or ruthenium.
Process for preparing arylalkanoic acid derivatives
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, (2008/06/13)
2-Aryl-C3 to C6 -alkanoate esters are prepared economically by reacting an enol ether of an aryl alkyl ketone with a trivalent thallium salt in an organic solvent. The trivalent thallium ions can be regenerated by adding a peracid and a reactive form of manganese, ruthenium, cobalt, iridium, hafnium, osmium or neobium to oxidize monovalent thallium ions to the trivalent state, in a sequential, continuous or stoichiometric procedure. The ester intermediate product is then converted to the corresponding 2-aryl-C3 - to C6 -alkanoic acid or salt thereof. The aryl group is selected so the resulting acid product will be a useful compound such as anti-inflammatory, analgesic and anti-pyretic drug or agriculturally useful product. Examples of drug acids which can be made by this process include ibuprofen, flurbiprofen, fenoprofen and naproxen and the like.
