Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Experimental program
Comparison scheme
Effect test

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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com