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The mechanism of phenol oxidation with hypervalent iodine reagents begins with the formation of an aryloxyiodonium(III) intermediate. Inter- or intramolecular nucleophilic attack then takes place, either in one step or in two via an oxenium ion. [ 4 ]
4-Hydroxyacetophenone monooxygenase is an enzyme that transforms piceol into O-acetylhydroquinone. This enzyme is found in Pseudomonas fluorescens. See also ...
The 4 substrates of this enzyme are (4-hydroxyphenyl)ethan-1-one, NADPH, H +, and O 2, whereas its 3 products are hydroquinone acetate ester, NADP +, and H 2 O. This enzyme belongs to the family of oxidoreductases , specifically those acting on paired donors, with O2 as oxidant and incorporation or reduction of oxygen.
Organoiodine compounds are prepared by numerous routes, depending on the degree and regiochemistry of iodination sought as well as the nature of the precursors. The direct iodination with I 2 is employed with unsaturated substrates: RHC=CH 2 + I 2 → RHIC-CIH 2. However, the reaction proceeds slowly with unstrained alkenes. [14]
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4-Hydroxyacetophenone (p-hydroxyacetophenone, piceol) Index of chemical compounds with the same name This set index article lists chemical compounds articles associated with the same name.
The mechanism of carbonyl oxidation by iodine(III) reagents varies as a function of substrate structure and reaction conditions, but some generalizations are possible. Under basic conditions, the active iodinating species are iodine(III) compounds in which any relatively acidic ligands on iodine (such as acetate) have been replaced by alkoxide ...
They inhibit release of thyroid hormones by the thyroid gland.The most studied drug in this class is lithium, which inhibits thyroid hormone secretion by inhibiting iodotyrosine coupling, thyroidal iodide uptake, and alteration in structure of thyroglobulin, [10] a protein which acts as a substrate for the synthesis of thyroid hormones and storage of inactive forms of T3, T4 and iodine within ...