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Oxidation of flavanones with Iodosobenzene diacetate, B24531 and other hypervalent iodine reagents has been studied under a variety of conditions. Either the corresponding flavone or the isoflavone can be obtained depending on the solvent and acid present: J. Chem. Res., 213 (1995). If the reaction is carried out in the presence of trimethyl orthoformate, a 1,2-aryl shift occurs, and the major product becomes the methyl 2-aryl-2,3-dihydrobenzofuran-3-carboxylate: Bull. Chem. Soc. Jpn., 68, 1168 (1995)./n
Hazard Statements: H302-H315-H319-H335
Harmful if swallowed. Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation.
Precautionary Statements: P261-P264b-P270-P271-P280-P301+P312-P302+P352-P304+P340-P305+P351+P338-P312-P330-P332+P313-P337+P313-P362-P501c
Avoid breathing dust/fume/gas/mist/vapours/spray. Wash face, hands and any exposed skin thoroughly after handling Do not eat, drink or smoke when using this product. Use only outdoors or in a well-ventilated area. Wear protective gloves/protective clothing/eye protection/face protection. IF SWALLOWED: Call a POISON CENTER or doctor/physician if you feel unwell. IF ON SKIN: Wash with plenty of soap and water. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Rinse mouth. If skin irritation occurs: Get medical advice/attention. If eye irritation persists: Take off contaminated clothing and wash before reuse. Dispose of contents/ container to an approved waste disposal plant