N-hydroxyphthalimide (NHPI), which is best known as an organocatalyst for efficient C-H activation, has been found to be oxidized by quinoid compounds to its corresponding catalytically active nitroxide-radical. Here, we found that NHPI can be isomerized into isatoic anhydride by an unusually facile two-step method using tetrachloro-1,4-benzoquinone (TCBQ, p-chloranil), accompanied by a two-ste...

Two rapid assay procedures based on visible spectrophotometry and high performance liquid chromatography (HPLC) have been developed for lansoprazole in bulk drug and in capsules. Spectrophotometric method is based on the formation of a charge-transfer (CT) complex between chloranilic acid (CAA) as a π-acceptor and lansoprazole (LPZ) as an n-donor in acetonitrile solvent, the absorbance of the c...