Synthesis and characterization of 9,9-bis(4-hydroxyphenyl and 4-aminophenyl)dibenzofluorenes: Novel fluorene-based monomers was written by Seesukphronrarak, Surasak;Kawasaki, Shinichi;Kuwata, Shigeki;Takata, Toshikazu. And the article was included in Journal of Polymer Science, Part A: Polymer Chemistry in 2019.Application of 73003-90-4 This article mentions the following:
Two novel 9,9-difunctionalized fluorene-type monomers, 9,9-bis(4-hydroxyphenyl- and 4-aminophenyl)-2,3:6,7-dibenzofluorenes, are synthesized by the reaction of dibenzenzofluorenone with phenol and aniline. These monomers are used for the preparation of polyester and polyimide as the typical polymers to evaluate the property change such as thermal stability caused by the benzene rings fused to the fluorene skeleton with keeping good solubility, in comparison with the polymers derived from simple fluorenone. In fact, these two new polymers have the fairly enhanced thermal stability and refractive index value along with satisfactory solubility in organic solvents, enough to emphasize the fusion effect. In the experiment, the researchers used many compounds, for example, 6-(2,5-Dioxotetrahydrofuran-3-yl)-4-methyl-7,7a-dihydroisobenzofuran-1,3(3aH,6H)-dione (cas: 73003-90-4Application of 73003-90-4).
6-(2,5-Dioxotetrahydrofuran-3-yl)-4-methyl-7,7a-dihydroisobenzofuran-1,3(3aH,6H)-dione (cas: 73003-90-4) belongs to tetrahydrofuran derivatives. Solid acid catalysis, and the advantages often associated with their use, have been proved equally efficient for the synthesis of tetrahydrofurans or furans. Oxidations have also proved to be valuable and efficient approaches to chiral tetrahydrofuran derivatives.Application of 73003-90-4
Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem