Direct Access to 1,4-Dihydroxyanthraquinones: The Hauser Annulation Reexamined with p-Quinones
摘要:
3-Phenylsulfanylphthalides (e.g. 8a) readily react with p-benzoquinones in the presence of (LiOBu)-Bu-t in THF to furnish 1,4-dihydroxyanthraquinones in good yields and one-pot operations.
An amperometric sensor suitable for determining the concentration of analyte in a sample, said sensor comprising an oxidase enzyme and a substituted 1,4-benzoquinone compound which, in oxidized form, functions as a mediator specific to reduced enzyme and which has a lower oxidation potential than unsubstituted 1,4-benzoquinone.