Fluoran derivatives. IV. Electronic absorption and emission spectra of mono- and disubstituted derivatives of 3,3-diphenylphthalide and fluoran was written by Gronowska, Janina;Rakowska, Tersa;Walerys, Henryk. And the article was included in Roczniki Chemii in 1973.Name: 3′,6′-Dimethoxy-3H-spiro[isobenzofuran-1,9′-xanthen]-3-one This article mentions the following:
The effect of Me, OMe, and OH groups on the electronic absorption spectra in 96% EtOH and absorption and emission spectra in 80% H2SO4 was determined for I (R = H, Me; R1 = H, Me, OMe, OH) and II (R,R1 = H, Me, OMe, OH). I were prepared by condensation of the corresponding aroylbenzoic acids with a substituted phenol in the presence of anhydrous ZnCl2 at 95-105°; demethylation and formation of phenolic products was observed at higher temperatures In the experiment, the researchers used many compounds, for example, 3′,6′-Dimethoxy-3H-spiro[isobenzofuran-1,9′-xanthen]-3-one (cas: 36886-76-7Name: 3′,6′-Dimethoxy-3H-spiro[isobenzofuran-1,9′-xanthen]-3-one).
3′,6′-Dimethoxy-3H-spiro[isobenzofuran-1,9′-xanthen]-3-one (cas: 36886-76-7) belongs to benzofurans derivatives. Benzofurans are compounds with a planar structure having 10 pi electrons that include the lone pair on oxygen atom, which makes it more susceptible to electrophilic attack. Benzofurans are stable towards alkali and readily polymerize on treatment with sulfuric acid, due to which they are useful for the preparation of low cost chemically relatively inert resins.Name: 3′,6′-Dimethoxy-3H-spiro[isobenzofuran-1,9′-xanthen]-3-one
Referemce:
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem