136954-79-5

Upstream product

• 105299-45-4 4-(4-hydroxphenylazo)benzoic acid 
• 150-13-0 4-amino-benzoic acid 
• 139056-48-7 4-(4-Pentyloxy-phenylazo)-benzoic acid ethyl ester 
• 4418-89-7 ethyl 4-[(4-hydroxyphenyl)diazenyl]benzoate 
• 108-95-2 phenol 
• 4418-89-7 ethyl 4-[(E)-2-(4-hydroxyphenyl)diazen-1-yl]benzoate 
• 139056-48-7 ethyl 4-((4-pentyloxyphenyl)diazenyl)benzoate 
• 94-09-7 p-aminoethylbenzoate 

Downstream Products

• 73921-64-9 2-methylbutyl p-(p-amyloxyphenylazo)benzoate 
• 1306600-11-2 C₂₇H₂₄N₂O₅ 
• 1642136-53-5 (E)-4-chloro-1,3-phenylene bis-[4-(4-pentyloxyphenylazo)benzoate] 
• 73182-55-5 amyl p-(p-amyloxyphenylazo)benzoate 

Relevant academic research and scientific papers

Monotropic or enantiotropic mesophases? Liquid-crystalline and solid state polymorphism 4-Chloro-1,3-phenylene bis-[4-(4-alkyloxyphenylazo)benzoates

This article presents a homologous series of bent-core molecules consisting of a 4-chlororesorcinol as a central unit and 4-[(4-alkyloxyphenyl)diazenyl] benzoic acids as wings. With the use of polarizing optical microscopy (POM), thermal analysis (TOA) and differential scanning calorimetry (DSC) the mesogenic properties were detected. Furthermore, the X-ray diffraction (XRD) measurements were also performed for selected samples. Compounds of the above mentioned series form nematic, B6, and smectic C mesophases. An interesting phenomenon in the solid phase polymorphism was observed in some cases. In our experiment one crystalline form (CrI) melts to nematic phase while the second form (CrII) melts at higher temperature directly to isotropic phase. The solid state modification determines whether a monotropic and an enantiotropic mesophase is observed.

Synthesis and physico-chemical properties for 2-oxochromen-6-yl 4-(4-alkoxyphenylazo)benzoates

This paper describes the preparation and thermal properties for homologous series of 2-oxochromen-6-yl 4-(4-alkoxyphenylazo)benzoates (compounds 1-n). Compounds 1-n show nematic phase exclusively, where the nematic-isotropic phase transition temperatures are between 293° C for 1-4 and 256° C for 1-8. Interestingly, compound 1-8 exhibits smectic A and re-entrant nematic phases in addition to the nematic one. The smectic A phase are characterized using a small angle X-ray diffraction study, indicating the smectic A phase has a partially bilayer molecular arrangement. Copyright Taylor & Francis Group, LLC.

OXIDATION OF SOME AZOBENZOIC ESTERS BY p-METHOXYCARBONYLPERBENZOIC ACID

During investigation of the oxidation of some azobenzoic esters with 40percent p-methoxycarbonylperbenzoic acid and with 30percent hydrogen peroxide it was established that the former is more effective as an oxidizing agent.The obtained mixtures of the corresponding azoxy compounds are characterized by the existence of nematic and smectic phases A and E.