Rohatgi, H. L. published the artcileOrganomercury derivatives as antiseptics. II. Symmetrical phthaleins and fluoresceins, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, the publication is Indian Journal of Applied Chemistry (1958), 117-20, database is CAplus.
Several sym. phthaleins and fluoresceins, their Hg and Br derivatives, were prepared and tested for bactericidal activity. Phthalic anhydride was treated with phenols to give the following compounds (phenol, % yield, dye formula, m.p. given): m-cresol, 54, C22H16O3, 215°; p-cresol, 54, C22H16O3, 246°; pyrocatechol, 54, C20H12O5, 200°; hydroquinone, 51, C20H12O5, 226°; pyrogallol, 71, C20H12O7, 285°; phloroglucinol, 57, C20H12O7, 250°; 1-naphthol, 49, C28H18O4, 234-5°; and 2-naphthol, 50, C28H16O3, 293°. The dyes were mercurated by the method of White (C.A. 15, 536) and the Hg substituents replaced by Br to give the following derivatives (dye, formula of Hg derivative, color of Hg derivative, color of Br derivative, m.p. of Br derivative given): phenolphthalein, C20H11O4(HgOAc)2(HgOH)2, light pink, light red, >300°; ο-cresolphthalein, C22H16O4(HgOAc)2, green, orange, 255°; 3,6-dimethylfluoran, C22H14O3(HgOAc)2, brown, orange, 249-50°; 2,7-dimethylfluoran, C22H14O3(HgOAc)2, brown, orange, 984-5°; 4,5-dihydroxyfluoran, C20H10O5(HgOH)2, green, dirty orange, 285°; 3,6-dihydroxyfluoran, C20H8O5(HgOAc)4 red, orange-red, >300°; 2,7-dihydroxyfluoran, C20H10O5(HgOH)2, brown, dirty orange, 200° (decomposition); 4,5-dihydroxyfluorescein, C20H10O7(HgOAc)2, deep red, red, >300°; 1,8-dihydroxyfluorescein, C20H8O7(HgOAc)4, dirty red, red, >300°; α-naphthophthalein, C28H17O4HgOAc, black, brown, >300°; and β-naphthophthalein, C28H15O3HgOAc, black-brown, >300°. The mercurated compounds were more active against Staphylococcus aureus and Escherichia coli than the dyes but not more active than mercurochrome.
Indian Journal of Applied Chemistry published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one.
Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem