33905-60-1

Upstream product

• 16331-46-7 4-ethoxybenzoylchloride 
• 123-31-9 hydroquinone 
• 619-86-3 4-(ethoxy)benzoic acid 
• 120-47-8 Ethyl 4-hydroxybenzoate 
• 23676-08-6 methyl 4-ethoxybenzoate 
• 99-76-3 methyl 4-hydroxylbenzoate 
• 103-16-2 4-Benzyloxyphenol 
• 99-96-7 4-hydroxy-benzoic acid 
• 23676-09-7 ethyl 4-ethoxybenzoate 

Downstream Products

• 816452-47-8 ω-[4-(p-ethoxybenzoyloxy)phenoxycarbonyl]valeric acid 
• 1428449-50-6 Bis[(4-ethoxybenzoyloxyphenoxy)hexyl]benzene-1,3-dicarboxylate 
• 1428449-49-3 4-(6-hydroxyhexyloxy)phenyl 4-ethoxybenzoate 
• 1459717-66-8 4-{[(4-ethoxyphenyl)carbonyl]oxy}phenyl thiophene-2-carboxylate 
• 1459717-71-5 4-{[(4-ethoxyphenyl)carbonyl]oxy}phenyl thiophene-3-carboxylate 
• 33905-67-8 C₂₃H₂₀O₆ 

Relevant academic research and scientific papers

Isophthalic acid based mesogenic dimers: Synthesis and structural effects on mesophase properties

Two series of mesogens based on isophthalic acid and side arms containing two and three phenyl rings linked through azomethine or ester groups were synthesized via divergent approach. Another type of structurally similar mesogen was synthesized via convergent approach in which the azomethine groups were replaced by ester groups. All the synthesized mesogens and their intermediates were structurally well characterized using FT-IR, 1H NMR, 13C NMR and EI-MASS spectrometry. The mesophase characterization was carried out using hot stage-polarizing optical microscopy (POM), differential scanning calorimetry (DSC) and X-ray diffraction (XRD) techniques. The structural changes made in the mesogens i.e. increase of terminal chain length and replacement of azomethine groups with ester groups decreased the transition temperatures whereas the increase of side arm length improves the phase stability to a wide temperature range. Nematic phase was observed for the mesogens with short terminal chain length whereas the smectic polymorphism was observed on increasing the terminal chain length. The structural modification (three ring) on the side arm core stabilizes the mesophases enantiotropically.

Synthesis and characterization of two phenyl ring core-based thiophene mesogens

Novel thiophene mesogens built with two phenyl ring core and alkoxy terminal chains are synthesized by multistep route. The phenyl ring core is connected to thiophene by ester unit at (a) 2-position and (b) 3-position to yield 2-series of mesogens. The structural characterization of them is accomplished by using spectroscopy tools and the mesophase characteristics are evaluated by HOPM and DSC. The 13C chemical shifts of representative mesogens calculated from DFT by quantum chemical calculations are compared with experimental 13C chemical shifts and further utilized for structural assignment of core unit carbons. A good agreement between calculated and experimental values is noticed. An enantiotropic nematic phase is confirmed for all the mesogens and accordingly threaded nematic texture in HOPM is observed and is supported by DSC transition enthalpy values. The mesophase as well as thermal stabilities of the mesogens are discussed with reference to terminal chain length and position of the linking unit on thiophene.

Mesomorphic properties of chiral nematic star-shaped liquid crystals containing melitose as cores

Three star-shaped compounds (SSCs, c1-c3), are synthesized by using melitose as the chiral core and monacid (b1, b2 and b3) as side arms, respectively. The side arms (b1, b2 and b3), in which terminal chains are different, are introduced into the hydroxyl groups of melitose by esterification, respectively. The chemical structures of c1-c3 are confirmed by FT-IR and 1H NMR. The roles played by the chiral core and the side arms in the mesomorphic properties of the SSCs are studied. b1 is not a liquid crystal (LC), while b2 and b3 are nematic LCs. c1 is not a LC, while c2 and c3 are star-shaped LCs (SSLCs) and exhibit fingerprint texture of chiral nematic. c1, c2 and c3 are all levo-SSCs, which are different from their parent cores. The absolute value of their specific rotation increases with the increase of the terminal chain length of the side arms. The melting temperature of SSCs decreases with the increase of the terminal chain length of the side arms. For c2-c3, their mesomorphic region increases with the increase of the terminal chain length of the side arms. The results suggest that the LC properties of the side arms play an important role in inducing LC properties of the SSCs and the chiral core induces the chiral nematic of SSLCs, which contain the nematic LCs as the side arms.

Structure and properties of novel three-armed star-shaped liquid crystals

A series of novel three-armed star-shaped liquid crystals based on 1,3,5-trihydroxybenzene as a core and ω-[4-(p-alkoxybenzoloxy) phenoxycarbonyl]valeric acid as mesogenic arms were synthesized. Their chemical structures were confirmed by FTIR and 1

Study of activation energy and order of reaction of some liquid crystals

Liquid crystals of the type p-phenylene-di-p-n-alkoxy benzoate have been prepared. Kissinger isothermal decomposition method has been used for determination of activation energy values of liquid crystals. Kissinger's assessment for shape index of DTA peaks is used to find the order of reaction. There is no direct relationship between the carbon atoms in terminal methylene groups and Ea values. Order of reaction value decreases with increase in heating rate upto carbon atoms 10 in the terminal methylene group but beyond this the order increases or decreases.

1,1'-Disubstituted Ferrocene-Containing Thermotropic Liquid Crystals of Structure 5-C5H4)COOC6H4XC6H4OCnH2n+1>2> (X=OOC or COO). Influence of the Orientation of the Central Ester Function on the Mesogenic Properties

The two series I and II of 1,1'-disubstituted ferrocenes which differ by the direction of the ester function included the rigid organic part were synthesized and their liquid crystal properties examined.These latter were found to be strongly dependent on the orientation of the connecting ester group and on the alkyl chain.