1552-42-7, Name is Crystal violet lactone, belongs to benzofurans compound, is a common compound. COA of Formula: C26H29N3O2In an article, once mentioned the new application about 1552-42-7.
In an acetonitrile solution, the extents of ionization of trityl halides (Ph3CX: X = Cl, Br) in the presence of various concentrations of alkali metal (M+ =Li+, Na+) and alkaline-earth metal (M2+ = Mg2+, Ca2+, Sr2+, Ba2+) perchlorates were examined by spectrophotometry. The promoted formation of the trityl ion (Ph+C-) in the presence of metal ions was attributed to “chemical” interactions, such as coordination or covalent bonding between the halide ions and M- or M2+ ions, and not merely the electrostatic interaction. The salt effects increased with methoxy-substituents on trityl chloride as non-substituted < 4-methoxy < 4,4?-dimethoxy< <4,4?,4?-trimethoxytrityl. At higher RX (or X-) concentrations, not only "coordination", but also precipitation reactions between X and M+ or M2+ (except for Li- and Mg2+) seemed to promote the ionization of RX. In the co-presence of a small amount of CH3SO3H, trityl benzoate gave the Ph3C- ion upon the addition of LiClO4 or Mg(ClO4)2. A red color with strong fluorescence due to the zwitterion (R+COO-) of Rhodamine (Rhodamine B base) was observed upon the addition of M+ and M2+, which should have been caused by an interaction between the metal ions and the intramolecule carboxylate (from the gamma-lactone) of Rhodamine in the solution. The gamma-lactone ring of Crystal Violet lactone in acetonitrile was cleaved by the addition of Mg(ClO4)3 to give a strong violet color, whereas, LiClO4, NaClO4, or Ba(ClO4)2 had no (or very small) effects in the solution. It was found that the interactions between X- or RCOO- and M2+ or M- in cetonitrile were strong enough to promote the ionization of partly ionized ciovalent bonds.
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Reference：
Benzofuran – Wikipedia,
Benzofuran | C8H4168O – PubChem