- Simple preparation method of spiral shell [fluorenes-9, 9'-xanthene]-3', 6'-diphenol and derivatives of spiral shell [fluorenes-9, 9'-xanthene]-3', 6'-diphenol
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The invention belongs to the technical field of organic compound preparation, and relates to a preparation method of spiral shell [fluorenes-9, 9'-xanthene]-3', 6'-diphenol and derivatives of the spiral shell [fluorenes-9, 9'-xanthene]-3', 6'-diphenol. The preparation method comprises the steps that an organic solvent, 9-fluorenone and resorcinol are sequentially added, then a catalyst is added, the mixture is placed in a microwave reactor with an air condensing tube and a reflux condensing device and reacted for 5-40 minutes under a stirring condition, an appropriate amount of water is addedafter cooling, stirring is performed for 20-40 minutes, a solid is precipitated by filtration, the obtained solid is dissolved by using an alcohol solvent or an ether solvent, and filtration and crystallization are performed to obtain a final product with a yield of more than 80%. The preparation method has the beneficial effects that the reaction time is greatly shortened, the reaction yield is improved, the cost is saved, and the preparation method is environmentally friendly.
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Paragraph 0005; 0025-0036
(2019/03/28)
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- Symmetric and asymmetric spiro-type colorless poly(ester imide)s with low coefficients of thermal expansion, high glass transition temperatures, and excellent solution-processability
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In this work, we present several new poly(ester imide)s (PEsIs) with low coefficients of thermal expansion (CTE), excellent optical transparency, very high heat resistance (Tg), film ductility, and solution-processability. Symmetric and asymmet
- Hasegawa, Masatoshi,Takahashi, Shinya,Tsukuda, Soichi,Hirai, Tomoki,Ishii, Junichi,Yamashina, Yukari,Kawamura, Yoshinori
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p. 167 - 184
(2019/03/14)
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- A method of manufacturing a compound having glucoskeleton dihydroxyxanthene dialkylfluorene
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PROBLEM TO BE SOLVED: To provide a novel method of producing a xanthene compound having a fluorene skeleton which is useful as a raw material for polyesters, polyurethanes, polycarbonates, epoxy resins, modified acrylic resins, and so on.SOLUTION: A method of producing a xanthene compound having a fluorene skeleton is characterized by producing through a single step of carrying out a condensation reaction of a fluorene with a polyhydric phenol and a dehydration reaction of the hydroxyl group at the same time by using water as a reaction solvent, feasibility of the reactions at relatively low temperatures of 65°C or lower and providing the xanthene compound with a good color phase and high purity by suppressing formation of multimers produced by reactions of a plurality of fluorenes with a plurality of polyhydric phenols and oligomers produced by polymerization of polyhydric phenols.
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Paragraph 0029
(2017/04/03)
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