Erabi, Tatsuo published the artcile9-Phenylxanthen-9-ylium and 9-phenylthioxanthen-9-ylium ions: Comparison of o- and p-substitutions in the 9-phenyl group by cyclic voltammetry and visible spectra, Recommanded Product: 9-Phenyl-9H-xanthen-9-ol, the publication is Bulletin of the Chemical Society of Japan (2002), 75(6), 1325-1332, database is CAplus.
9-Arylxanthen-9-ylium and 9-arylthioxanthen-9-ylium perchlorates I [X = O, S; R = Ph, 2,4,6-(MeO)3C6H2, 2,6-(MeO)2C6H3, 2-MeOC6H4, 4-MeOC6H4, etc.] were prepared by the reactions of the corresponding 9-arylxanthen-9-ols or 9-arylthioxanthen-9-ols II with HClO4. The LUMO and HOMO levels of I were estimated from the redox potential (E0) in cyclic voltammetry and λmax in the UV-visible spectra measured for a 1,2-dichloroethane solution, and were compared with those of 9-aryl-1,8-dimethoxyxanthen-9-ylium ions III. The studies showed that (1) both the LUMO and HOMO levels varied almost in the same order of substituent on the 9-Ph group; (2) the MeO-group on the 9-Ph group was more effective to raise both the HOMO and LUMO levels than the Me-group; (3) the HOMO levels of I were more sensitive than the LUMO levels to the change in the 9-aryl group; (4) p-substitution by MeO- or Me-groups was more effective to raise the HOMO and LUMO levels than o-substitution; (5) the presence of two o-MeO groups was more effective to raise the HOMO and LUMO levels than one o-MeO group; (6) m-bromination of 9-aryl group in I [X = O, S; R = 2,6-(MeO)2C6H3] greatly lowered both LUMO and HOMO levels; (7) both the HOMO and LUMO levels of III [R = Ph, 2,6-(MeO)2C6H3] were higher than those of the resp. I [X = O; R = Ph, 2,6-(MeO)2C6H3]; (8) the LUMO level of I [X = O, R = 2,6-(MeO)2C6H3] was higher than that of III (R = Ph), the isomer.
Bulletin of the Chemical Society of Japan published new progress about 596-38-3. 596-38-3 belongs to alcohols-buliding-blocks, auxiliary class Other Aromatic Heterocyclic,Benzene,Alcohol, name is 9-Phenyl-9H-xanthen-9-ol, and the molecular formula is C19H14O2, Recommanded Product: 9-Phenyl-9H-xanthen-9-ol.
Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts