Method for preparing 1,4-bis(dichloromethyl) tetrafluorobenzene

A technology of dichloromethyl and tetrafluorobenzene is applied in the field of preparation of 1,4-bis(dichloromethyl)tetrafluorobenzene, and can solve the problems of long reaction time, low yield, unsuitability for mass production and the like

Inactive Publication Date: 2009-09-09
YUAN SHIN MATERIALS TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0019] However, the disadvantage of this method is that the reaction time is long, the yield is low, and it needs to be purified by silica gel column chromatography, which is not suitable for mass production

Method used

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  • Method for preparing 1,4-bis(dichloromethyl) tetrafluorobenzene
  • Method for preparing 1,4-bis(dichloromethyl) tetrafluorobenzene
  • Method for preparing 1,4-bis(dichloromethyl) tetrafluorobenzene

Examples

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Embodiment 1

[0050] Example 1: Preparation of 1,4-bis(dichloromethyl)tetrafluorobenzene (with toluene as solvent and dimethylformamide as catalyst)

[0051] Add 15.45gm of tetrafluoroterephthalaldehyde (TFTPA), 3.01gm of dimethylformamide (DMF) and 15.01gm of toluene into a 250ml three-port glass reactor (with temperature probe, condenser tube and ventilation tube) , under nitrogen, slowly add 63.37gm of SOCl from the temperature probe port to the feeding funnel 2 . Then, after replacing the feeding funnel with a temperature probe, start heating with an oil bath and stir with a magnetic stirrer. At this time, the nitrogen can be turned off, and the reflux reaction (85 to 95° C.) is performed for two hours, and gas chromatography (Gas Chromatography; GC) showed that the reaction was complete. After the reaction solution was cooled to room temperature, slowly introduce ice water to remove excess SOCl 2 Hydrolyzed, the water layer was separated after standing for stratification. Then, an ...

Embodiment 2 16

[0057] Embodiment two to sixteen: preparation 1,4-bis(dichloromethyl)tetrafluorobenzene

[0058] The preparation method of embodiment two to sixteen is the same as embodiment one. The amounts of related reactants, solvents, reaction conditions and yields used in Examples 2 to 16 are shown in Table 1.

[0059] Examples two to sixteen show solvent-free or toluene, chloroform, p-xylene, 1,4-dioxane, 1,2-dichloroethane, carbon tetrachloride, tetrahydrofuran, nitrobenzene or O-dichlorobenzene can be used as a solvent for the reaction; the catalyst is the most ideal formamide series compound.

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Abstract

The invention relates to a method for synthesizing 1,4-bis(dichloromethyl) tetrafluorobenzene, which prepares the 1,4-bis(dichloromethyl) tetrafluorobenzene through the reaction of tetrafluoroterephthaldehyde, SOC12 and an organic solvent. A formamide compound is added as a catalyst to reduce the time for the reaction for preparing the 1,4-bis(dichloromethyl) tetrafluorobenzene, simplify the preparation steps and improve the 1,4-bis(dichloromethyl) tetrafluorobenzene yield.

Description

Technical field] [0001] The present invention relates to a method for preparing 1,4-bis(dichloromethyl)tetrafluorobenzenee (1,4-Bis(dichloromethyl)tetrafluorobenzenee, DCMTFB), especially a method with high yield and suitable for mass production Process for the preparation of 1,4-bis(dichloromethyl)tetrafluorobenzene. Background technique [0002] Since parylene polymer has many processing advantages, such as the coating environment is room temperature, no residual stress occurs after coating and the thickness of the deposited film can be precisely controlled, and the parylene film is uniform, acid-resistant and resistant. Alkali, colorless, high transparency, and low dielectric properties, so it is widely used in the electrical isolation of printed circuit boards, the moisture-proof protection of sensors or medical instruments, and the corrosion protection of metal coatings...etc. . Currently, fluorine-containing poly-p-xylylene (fluoroparylene polymer) has a low dielectr...

Claims

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Application Information

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IPC IPC(8): C07C25/13C07C17/269
Inventor 何潜渊林材峰林俊旭王时俊
Owner YUAN SHIN MATERIALS TECH CORP
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