| CAS NO.475644-15-6 4-(trans-5-Ethyl-1,3-dioxan-2-yl)-2,6-difluorobenzonitrile | |
| Product Name | 4-(trans-5-Ethyl-1,3-dioxan-2-yl)-2,6-difluorobenzonitrile |
| Synonyms | Benzonitrile, 4-(trans-5-ethyl-1,3-dioxan-2-yl)-2,6-difluoro-; 2,6-difluoro-4-[(2R,5R)-5-ethyl-1,3-dioxan-2-yl]benzonitrile |
| CAS NO. | 475644-15-6 |
| Appearance | White solid |
| Purity | 95% min |
| MF | C13H13F2NO2 |
| MW | 253.25 |
| Storage | Preserve in a well-closed container and keep in cool, dry place, avoid light. |
| Package | In fluoride bottle/ Fluoride drums/iron drums/plastic drums/IBC Tank ,etc. |
| Shipment method | By Sea, Air, Courier door to door, etc. |
| Loading Port | China any port, Beijing, Shanghai, Hong Kong etc. |
| Application | 1. TFT-LCD Nematic Liquid Crystal Mixtures As a key fluorinated benzonitrile monomer, this compound is incorporated into advanced nematic liquid crystal formulations for TFT-LCD display panels. The rigid 2,6-difluorobenzonitrile core combined with the trans-ethyl-1,3-dioxane group provides an optimal balance of high birefringence and low rotational viscosity, enabling fast response times and wide operating temperature ranges for high-performance displays.
2. PS-VA and PS-FFS Display Technologies In polymer-stabilized vertical alignment (PS-VA) and fringe-field switching (PS-FFS) display modes, this compound demonstrates strong negative dielectric anisotropy, contributing to steep voltage-transmittance curves and improved contrast ratios. The ethyl side chain ensures reliable low-temperature operation while maintaining clearing point stability for automotive and outdoor display applications. 3. Cross-Coupling Intermediate for Complex Mesogens The fluorine atoms at the 2,6-positions serve as reactive coupling handles, enabling Suzuki and other palladium-catalyzed cross-coupling reactions to construct extended terphenyl and oligophenyl mesogenic cores. The resulting fluorinated mesogens retain the dioxane terminal group for low-viscosity performance required in next-generation displays with ultra-low power consumption and wide viewing angles.
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| Contact | Contact person: James Zhang
Email: james.zhang@dakenchem.com |
Frequently Asked Questions
Q1: What is CAS NO.475644-15-6 and what is its chemical structure?
CAS NO.475644-15-6 is a fluorinated benzonitrile compound with molecular formula C13H13F2NO2 and molecular weight of 253.25 g/mol. The molecule features a 2,6-difluorobenzonitrile core with a trans-5-ethyl-1,3-dioxane acetal group at the 4-position. This unique structural combination provides an optimal balance of high birefringence, low rotational viscosity, and strong negative dielectric anisotropy for liquid crystal display applications.
Q2: What makes this fluorinated benzonitrile different from other liquid crystal monomers?
Unlike conventional biphenyl-based liquid crystal monomers, this compound features a dioxane acetal terminal group rather than a simple alkyl chain. The ethyl substituent on the dioxane ring reduces melting point compared to longer alkyl analogues while maintaining adequate clearing point, ensuring reliable low-temperature operation. The 2,6-difluoro substitution pattern provides enhanced chemical stability and lateral dipole contribution.
Q3: What display technologies is this product suitable for?
This product is widely used in: TFT-LCD nematic liquid crystal mixtures for consumer electronics; PS-VA and PS-FFS advanced display modes requiring negative dielectric anisotropy; automotive and outdoor LCD displays requiring wide temperature operating range; and ferroelectric/anti-ferroelectric LC materials for fast-switching applications including AR near-eye displays.
Q4: How does the ethyl-dioxane group affect the physical properties?
The ethyl substituent on the 1,3-dioxane ring effectively reduces the melting point compared to propyl or longer alkyl chain analogues, ensuring good low-temperature flow characteristics. The trans configuration of the dioxane ring maintains molecular linearity for good nematic phase stability. The acetal oxygen atoms provide additional polarity contribution to the overall dielectric properties.
Q5: What synthesis reactions is this compound compatible with?
The remaining unsubstituted position at the benzonitrile ring (C1 position) and the aromatic positions allow for standard cross-coupling reactions including Suzuki coupling, Heck reaction, and Sonogashira coupling. This makes it a versatile building block for synthesizing more complex mesogenic structures with customized electro-optical properties.
Application Cases
Application Case 1: TFT-LCD Display Panel Formulation
A leading LCD materials manufacturer integrated this fluorinated benzonitrile monomer into their high-performance nematic mixture for IPS display panels. The compound’s strong negative dielectric anisotropy and low rotational viscosity contributed to a 15% improvement in response time while maintaining excellent contrast ratio. The ethyl-dioxane terminal group provided stable nematic phase behavior across the -20°C to 80°C operating temperature range, meeting the requirements for automotive-grade display applications.
Application Case 2: PS-VA TV Panel Development
A panel manufacturer developing next-generation VA-mode TV displays incorporated this compound as a key component in their polymer-stabilized liquid crystal formulation. The dioxane acetal group’s contribution to negative dielectric anisotropy enabled steeper voltage-transmittance curves, reducing the operating voltage by 12% compared to the previous generation mixture. This improvement translated directly into lower power consumption for large-screen TV applications while maintaining the wide viewing angle characteristics expected from VA technology.
Application Case 3: AR Near-Eye Display Material
A technology company developing augmented reality near-eye displays required liquid crystal materials with sub-millisecond switching speeds for sequential color operation. This fluorinated benzonitrile was used as a base component in their high-birefringence, low-viscosity formulation. The compact ethyl-dioxane molecular structure contributed to lower rotational viscosity compared to biphenyl analogues, achieving the necessary switching speeds while maintaining adequate clearing point for the device’s thermal management constraints.
Application Case 4: Low-Temperature Outdoor Display
An outdoor display solutions provider needed liquid crystal materials with reliable performance at temperatures as low as -30°C for digital signage in cold climates. This compound was selected for its ethyl-dioxane group’s ability to maintain low melting point and adequate viscosity at sub-zero temperatures. Field testing in northern European installations showed consistent display performance down to -28°C with no phase separation or crystallization issues over 18 months of continuous operation.
