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4,6-difluoro dibenzothiophene derivates

A compound, -OCF2- technology, applied in 4 fields, can solve the problems of unfinished research and development in the field of liquid crystal materials, and achieve high-definition bright spots, good low temperature and long-term stability, and easy preparation.

Active Publication Date: 2015-12-16
MERCK PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Research and development in the field of liquid crystal materials is still far from complete

Method used

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  • 4,6-difluoro dibenzothiophene derivates
  • 4,6-difluoro dibenzothiophene derivates
  • 4,6-difluoro dibenzothiophene derivates

Examples

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Embodiment 1

[0152] Example 1: 3-ethoxy-4,6-difluoro-7-pentyldibenzothiophene

[0153]

[0154] step 1

[0155]

[0156] 0.058 mol of 2-bromo-6-fluorophenol was dissolved in 100 ml of THF and 40 ml of water, and 0.09 mol of potassium carbonate was added. After warming to the boiling point, 0.3 mmol of tris(dibenzylideneacetone) dipalladium (0) and 0.9 mmol of A (bis(1-adamantyl)-n-butylphosphine), and 0.062mol (4-ethoxy-2,3-difluorobenzene base)-dimethoxyborane solution. The mixture was boiled at reflux for another 16 hours, then water and MIB were added, and the mixture was subjected to extractive work-up. The crude product 4'-ethoxy-3,2',3'-trifluorobiphenyl-2-ol was purified by chromatography (eluent: chlorobutane) to give white crystals.

[0157] step 2

[0158]

[0159] 0.022 mol of 4'-ethoxy-3,2',3'-trifluorodiphenyl-2-ol, 0.036 mol of triethylamine and 0.6 mmol of DMAP were dissolved in 50 ml of dichloromethane. 0.03 mol of trifluoromethanesulfonic anhydride was a...

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Abstract

The invention relates to 4,6-difluoro dibenzothiophene derivates of formula I, wherein R1, R2, A1, A2, Z1, Z2, m and n are as defined in claim 1, their preparation, their use as components in liquid-crystalline media and electro-optical display elements, which contain the novel liquid-crystalline media.

Description

technical field [0001] The present invention relates to 4,6-difluorodibenzothiophene derivatives, processes for their preparation, liquid-crystalline media comprising these derivatives, and electro-optic display elements comprising these liquid-crystalline media. Such compounds have negative dielectric anisotropy. Background technique [0002] Liquid crystals have been widely used since commercially available liquid crystal compounds were first discovered about 30 years ago. Known fields of application of conventional mixtures are in particular displays for watches and pocket calculators, and large display panels used in railway stations, airports and stadiums. Additional areas of application are displays for laptop and desktop computers, navigation systems and video applications. Especially for the last-mentioned applications, the response time and contrast of the image are highly required. [0003] The spatial arrangement of molecules in liquid crystals has such an effe...

Claims

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Application Information

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IPC IPC(8): C07D333/76C09K19/34G02F1/1333
CPCC07D333/76C09K19/3491G02F1/1333C07D409/04
Inventor V·赖芬拉特H·希尔施曼
Owner MERCK PATENT GMBH
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