320 results about "Fluorenone" patented technology

The invention relates to a method for producing 9-fluorenone, comprising the following steps of: (1) feeding industrial fluorine as a raw material and methylbenzene as a solvent into a reaction kettle according to the weight ratio of 1:(6-8) with quaternary ammonium salt as a catalyst; heating the mixture to 40-80DEG C; adding the catalyst after the raw material is completely dissolved at the addition of 5-20 percent of industrial fluorine; introducing the air according to 2-3m<3> / h of each kilo of industrial fluorine and reacting under the condition of 40-80DEG C for 2-5h; (2) after the reaction is ended, pouring a reactant into a distillation kettle for distillation at normal temperature, recovering the solvent and obtaining an industrial fluorine crude product from the bottom of the kettle; and (3) recrystallizing the crude product with the solvent to obtain fluorenone with the content of 99 percent. The method has the advantages of simple process flow, fewer reactants and low cost, is easy to control and can be widely used for producing the fluorenone; and the finished products prepared by the method have favorable quality.

This invention relates to a novel organophotoreceptor that includes:(a) a charge transport material comprising a fluorenone hydrazone having a) at least two fluorenone alkylsulfonylphenylhydrazone groups, b) at least two fluorenone pyrrolylhydrazone groups, c) at least two fluorenone benzotriazolylhydrazone groups, d) at least two fluorenone sulfolanylhydrazone groups, e) at least two fluorenone pyrazolylhydrazone groups, f) at least two fluorenone naphthylhydrazone groups, g) at least two fluorenone tetrazolylhydrazone groups, h) at least two fluorenone stilbenylhydrazone groups, or i) at least two fluorenone (9H-fluoren-9-ylidene)benzylhydrazone groups. Some of these fluoreneones may be represented by the formula where n is an integer between 2 and 6, inclusive; R1 is hydrogen, an alkyl group, or an aryl group; R2 is an alkylsulfonylphenyl or one of its derivatives; X is a linking group. The compounds may form electrostatic imaging systems in combination with(b) a charge generating compound; and(c) an electrically conductive substrate.

A novel novolac prepared by acid catalyzed condensation between biphenols or bisphenofluorenes and fluorenone is presented. The polymers exhibit excellent oxidative thermal stability and high carbon content, suitable for dielectric, etch stop applications as spin-on material.

The invention provides a diarylfluorene intermediate preparation method and relates to the application field of fine organic synthesis and photovaltaic material. Diarylfluorene can be used as an important intermediate in the material fields such as organic electroluminescence, photovoltaic cells, organic electrical storage, organic non-linear optics, chemical sensor and biosensor, organic laser and the like. The preparation method of diarylfluorene intermediate comprises the following two specific steps: (1) using arylamine, arylamine hydrochloride and fluorenone or the derivative of fluorenone to react under heat condition, alkalifying, stirring, filtrating and washing to obtain high purity intermediate product; (2) adding the intermediate product in dichloromethane to react with alkyl nitrite on the condition of refluxing and finally obtaining the high purity target product through recrystallization. The diarylfluorene intermediate preparation method has the advantage that (1) two-step method is adopted to prepare diarylfluorene intermediate, the raw material is cheap, the steps are simple, the yield is high and the product is easy to purify; (2) the method has mass production value and is environmentally friendly.

The invention provides a clean, environmentally-friendly and economic bisphenol fluorene synthesizing method, and relates to the field of preparation and organic synthesis of bisphenol fluorene monomers. The method comprises the following steps of: (1) preparation: synthesizing bisphenol fluorene by using cheap 9-fluorenone serving as a starting raw material and phenol in the presence of an acid catalyst and a thiohydracrylic acid cocatalyst; and (2) post treatment: adding a weak base salt to neutralize the catalyst, adding an organic solvent for dissolving, filtering, collecting an organic phase, and reclaiming the solvent and the redundant phenol under reduced pressure. The method is few in reaction steps and easy to operate, the reaction time is shortened, the production efficiency is greatly improved, and industrialized production is facilitated.

The invention discloses double-furofluorenone and a derivative thereof. The double-furofluorenone adopts the structure as shown in the specification. The preparation method comprises the following steps: by taking 2,7-dihydroxy fluorenone as a raw material, enabling 2,7-dihydroxy fluorenone to react with bromo-acetadehyde diethylacetal so as to obtain ether, and performing direct ring closure by using polyphosphoric acid so as to obtain double-furofluorenone; by taking 2,7-dihydroxy fluorenone as a raw material, enabling 2,7-dihydroxy fluorenone to react with bromo-acetadehyde diethylacetal so as to obtain ether, reducing fluorenone by using a Huang-ming-long method, further enabling reaction with 1-bromohexane under the action of sodium hydride, and finally performing polyphosphoric acid ring closure, thereby obtaining 9,9-dihexyl double-furofluorenone. Due to the adoption of the compound disclosed by the invention, novel option can be provided for a predecessor of an organic field effect crystal tube material, and the range of an organic electroluminescence material is widened.

The present invention relates to novel donor-acceptor fluorene compounds, which can be used as for the fabrication of electroluminescent devices, and a process of preparing said novel compounds. More particularly, the present invention relates to amine donor and nitrile / ester acceptor fluorenes, fluorenones their pi-conjugated systems and related compounds, processes for preparing the said compounds including oxidation of fluorenes to corresponding fluorenones and their use in preparing organic electronic devices such as organic light emitting diodes (OLEDs), photovoltaic / solar cell, field effect transistors and other useful electroluminescent devices. The compounds are prepared by reacting 2H-pyran-2-ones in isolated or rigid conformations with cyclic ketones containing methylene carbonyl moiety in the presence of a base in- an organic solvent. The present invention also relates to a new concept and approach to overcome the problem of 'Green emission defect' in 9-unsubstituted fluorene-based organic light emitting diodes which occurrs due to the conversion of fluorenes to fluorenones that show emission mainly in green-yellow region. In the present invention we have placed donor-acceptor substituents in such a way that donor-acceptor fluorenones show emission in the blue region (instead of green-yellow region) thus improving the blue colour purity and overcoming the problem of green emission defect.