121219-25-8

Basic information

• Product Name: 1,3-Difluoro-5-pentylbenzene
• Synonyms: 1,3-Difluoro-5-pentylbenzene;Benzene, 1,3-difluoro-5-pentyl-;,3-Difluoro-5-pentylbenzene
• CAS NO: 121219-25-8
• Molecular Formula: C₁₁H₁₄F₂
• Molecular Weight: 184.228
• Product Categories: Liquid crystal intermediates
• Mol File: 121219-25-8.mol

Chemical Properties

• Boiling Point: 197.2 °C at 760 mmHg
• Flash Point: 58.4 °C
• Appearance: /
• Density: 1.022
• Vapor Pressure: 0.54mmHg at 25°C
• Refractive Index: 1.463
• Storage Temp.: 2-8°C
• CAS DataBase Reference: 1,3-Difluoro-5-pentylbenzene(CAS DataBase Reference)
• NIST Chemistry Reference: 1,3-Difluoro-5-pentylbenzene(121219-25-8)
• EPA Substance Registry System: 1,3-Difluoro-5-pentylbenzene(121219-25-8)

Safety Data

• Hazardous Substances Data: 121219-25-8(Hazardous Substances Data)

Usage

Uses

Used in Liquid Crystal Compounds Industry:
1,3-Difluoro-5-pentylbenzene is used as a reactant for the preparation of liquid crystal compounds that exhibit high dielectric anisotropy. This property is crucial for the development of advanced liquid crystal materials with improved performance characteristics, such as faster response times and enhanced electro-optic effects, which are essential for various display and sensor applications.

InChI:InChI=1/C11H14F2/c1-2-3-4-5-9-6-10(12)8-11(13)7-9/h6-8H,2-5H2,1H3

Upstream product

• 121219-24-7 3,5-difluoro-1-pent-1'-enylbenzene 
• 110-62-3 pentanal 
• 461-96-1 3,5-difluorobromobenzene 
• 121219-23-6 1-(3,5-difluorophenyl)pentan-1-ol 
• 110-53-2 1-Bromopentane 
• 628-17-1 amyl iodide 

Downstream Products

• 123843-55-0 2,6-difluoro-4-pentylbenzoic acid 
• 1443253-88-0 4'S-[2,6-difluoro-4-pentylphenyl]ethynyl-4'-(2-methyl-1-butyl)biphenyl 
• 147437-93-2 C₁₁H₁₃F₂I 
• 123843-78-7 4-cyano-3-fluorophenyl 2,6-difluoro-4-pentylbenzoate 

Relevant articles and documents

New low polar tolane cholesterics designed for infrared applications

We have designed, synthesized and evaluated the physical properties of new fluorinated phenyltolane based chiral liquid crystal materials with 2-methylbutyl terminal chain. The 2- or 2,6-fluorosubstitution in combination with the phenyltolane core brings surprising improvement of mesomorphic properties. The investigated compounds are characterized by a broad temperature range of the cholesteric (chiral nematic N?) phase, very low melting temperatures and easy thermal control of selective reflection in the near infrared region. The moderate helical twisting power β, high optical anisotropy and source of a blue phase make these compounds attractive for cholesteric mixture formulations.

The synthesis of chiral fluorinated 4-alkyl-4′-[(4-alkylphenyl) ethynyl]biphenyls

We have designed, synthesized, and evaluated the physical properties of new fluorinated phenyltolane based chiral liquid crystal materials with 2-methylbutyl chains. This type of fluoro-substitution in chemical combination with a phenyltolane core brings a surprising improvement to the mesomorphic properties. The investigated compounds exhibit broad temperature ranges for the N* phase and very low melting points. All homologues exhibited Blue Phase. We have applied a Cu-catalyzed cross-coupling reaction between aryl Grignard reagents and alkyl bromides for the synthesis of the products.

The Synthesis and Transition Temperatures of Some Fluoro-Substituted 4-Cyanophenyl and 4-Cyanobiphenyl-4'-yl 4-Pentyl- and 4-Butoxy-Benzoates

A series of 4-cyanophenyl 4-X-benzoates and a series of 4-cyanobiphenyl-4'-yl 4-X-benzoates (X= pentyl, butoxy) have been prepared without fluoro-substitution and with mono-fluoro to tetra-fluoro-substitution; all possible combinations of substitution patterns at the positions ortho- to the cyano group and ortho- to the carboxylate group have been obtained in an attempt to determine the structural features which are responsible for some members of these series showing very large positive values of dielectric anisotropy.The synthesis of novel precursors required for the preparation of these esters is described and the melting points and transition temperatures of the esters are discussed and an explanation is provided for the variation of Tn-1 values with position and extent of fluoro-substitution. - Keywords: Fluoro-substitution, phenyl and biphenyl benzoates, terminal cyano namatogens.

FLUORINATED OLIGOPHENYLS AND THEIR USE IN LIQUID CRYSTAL MATERIALS

This invention relates to fluorinated oligophenyls of formula (I), in which a is 0 or 1 and in which the terminal sub-stituents R1, R2 and R3 are each independently an alkyl or alkenyl residue each with up to 15 C atoms, optionally substitut-ed by CN or by at least one halogen atom, and wherein one or more non adjacent CH2 groups of these residues may be replaced by -O-, -S-, -CO-, -O-CO-, -CO-O-, -O-CO-O- or -C≡C-, one of the residues R1 and R2 may also denote a group of formula (II), any one of the following pairs of lateral substituents are both fluorine: (A, B), (C, D), (D, E), (C, E), (B, C), (D, J), (D, K), (A, C), (C, J), (C?, D?), (D?, E), (D?, A), (C?, E), (C?, A), (D?, J?), (D?, K?), (C?, J?), (B, G), (A, G), all of the other lateral substituents being hydrogen or fluorine, and to their use as components of liquid crystalline compositions.