21782-87-6

Upstream product

• 490-79-9 2,5-dihydroxybenzoic acid. 
• 108-88-3 toluene 
• 100-39-0 benzyl bromide 
• 4955-90-2 sodium 2,5-dihydroxybenzoate 
• 100-44-7 benzyl chloride 
• 10590-85-9 benzyl 2-(β-D-glucopyranosyloxy)-5-hydroxybenzoate 

Downstream Products

• 20633-70-9 trichocarpine tetraacetate 
• 17019-77-1 benzyl 2-(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyloxy)-5-acetoxybenzoate 
• 205689-89-0 benzyl 2,5-di(4'-butyloxybenzoyloxy)benzoate 
• 210816-66-3 C₃₅H₄₀O₈ 
• 131355-99-2 (but-3''-enyl) 2,5-di(4'-butyloxybenzoyloxy)benzoate 
• 1429519-53-8 C₃₂H₃₄O₈ 
• 205689-93-6 2,5-di(4'-butyloxybenzoyloxy)benzoic acid 

Relevant academic research and scientific papers

PHENOLIC GLYCOSIDES FROM SALIX BABYLONICA

Key Word Index - Salix babylonica; Salicaceae; 2'-O-acetyltrichocarpin; trichocarpin; salicin; flavonoid glucosides, Abstract - From the leaves of Salix babylonica, the new naturally occurring benzyl ester of gentisic acid 2'-O-acetyl β-D-glucoside has be

Divergent Synthesis of Natural Benzyl Salicylate and Benzyl Gentisate Glucosides

Herein is reported the first total synthesis of benzyl salicylate and benzyl gentisate glucosides present in various plant species, in particular the Salix genus, such as Populus balsamifera and P. trichocarpa. The method permits the synthesis of several natural phenolic acid derivatives and their glucosides starting from salicylic or gentisic acid. The divergent approach afforded access to three different acetylated glucosides from a common synthetic intermediate. The key step in the total synthesis of naturally occurring glycosides - the selective deacetylation of the sugar moiety - was achieved in the presence of a labile benzyl ester group by employing mild deacetylation conditions. The protocol permitted synthesis of trichocarpine (4 steps, 40% overall yield), isotrichocarpine (3 steps, 51% overall yield), trichoside (6 steps, 40% overall yield), and deoxytrichocarpine (3 steps, 42% overall yield) for the first time (>95% purity). Also, the optimized mild deacetylation conditions allowed synthesis of 2-O-acetylated derivatives of all four glycosides (5-17% overall yield, 90-95% purity), which are rare plant metabolites.

MONOMER, POLYMER, COMPENSATION FILM, OPTICAL FILM, AND DISPLAY DEVICE

A monomer is represented by Chemical Formula 1: wherein, in Chemical Formula 1, R1, R2, o, p, L1, A1, Ra, m, and n are the same as defined in the detailed description.

Poly[(side-on mesogen)-Alt-(end-on mesogen)]: A compromised molecular arrangement

In recent years, sequence-controlled side-chain liquid crystal polymers (SCLCPs) have gained extensive interest because mesogenic units with different lengths and distributions can form various ordered sequences, which further endow LCP materials with diverse functions. In this manuscript, a side-chain side-on maleimide-containing monomer 2,5-bis-(4-butoxy-benzoyloxy)-benzoic acid 6-(2,5-dioxo-2,5-dihydro-pyrrol-1-yl)-hexyl ester (Y1801) and a side-chain end-on styrene-containing monomer 4′-[6-(4-vinyl-phenoxy)-hexyloxy]-biphenyl-4-carbonitrile (Y1802) are combined in one single macromolecular chain and orderly polymerized in an alternative sequence to form an alternating copolymer Poly(Y1801-Alt-Y1802). The chemical structure and alternating sequence of Poly(Y1801-Alt-Y1802) are confirmed by GPC and NMR techniques. The combination of DSC, POM, and WAXS data indicates that, although the side-on homopolymer PY1801 and the end-on homopolymer PY1802 both exhibit the nematic phase, their alternating copolymer Poly(Y1801-Alt-Y1802) shows an interdigitated smectic A phase, a compromised molecular arrangement instead. In addition, a strong fluorescence emission of Poly(Y1801-Alt-Y1802) is observed, which might provide this novel alternating-structured liquid crystal polymer with potential applications in luminescent materials and devices.

Catalytic asymmetric synthesis of aryl diphenol the axis chiral is joint method

The invention discloses a method for catalyzing asymmetrically synthesized axially chiral biaryl diphenol. In an organic solvent, chiral phosphoric acid is taken as a catalyst, a compound shown in a formula III is obtained by reaction on a compound shown

Homeotropically-aligned main-chain and side-on liquid crystalline elastomer films with high anisotropic thermal conductivities

Homeotropically-aligned main-chain and side-on liquid crystalline elastomer films are prepared by using LC thiol-ene and acrylate systems respectively. Evaluated by laser flash analysis, the room temperature thermal conductivities of these two LCP films in the film normal direction are both dramatically higher than those along the horizontal direction.

Atroposelective Synthesis of Axially Chiral Biaryldiols via Organocatalytic Arylation of 2-Naphthols

The first phosphoric acid-catalyzed asymmetric direct arylative reactions of 2-naphthols with quinone derivatives have been developed, providing efficient access to a class of axially chiral biaryldiols in good yields with excellent enantioselectivities u

Polysiloxane-based liquid crystalline polymers and elastomers prepared by thiol-ene chemistry

A series of side-chain liquid crystalline polymers (LCPs) with polysiloxane backbones have been synthesized by grafting mesogenic monomers to poly[3-mercaptopropylmethylsiloxane] (PMMS) via thiol-ene click chemistry. Their properties were studied in detail by a combination of 1H NMR, gel permeation chromatography, thermogravimetric analysis, differential scanning calorimetry, polarized optical microscopy and small-angle X-ray scattering. In comparison with the traditional hydrosilylation method which requires noble metal catalyst platinum, this newly designed thiol-ene protocol produces polysiloxane-based LCPs with only anti-Markovnikov addition products under benign conditions. Moreover, by controlling the molar ratio of PMMS and mesogenic monomers, PMMS-based LCPs can be partially functionalized, meanwhile leaving spare mercapto groups, which could be further used as cross-linking sites to prepare polysiloxane-based liquid crystalline elastomers (LCEs). Besides preparing LCE fibers with a maximum contraction of 42% at nematic-to-isotropic transition temperature, we further explored the feasibility of using surface-rubbed cells to synthesize LCE films, but it turned out that this method could uniaxially align the mesogens of preformed short polymers but not the backbone chains so that the thermal-actuation effects of these films were modest.

Chemoselective esterification of phenolic acids in the presence of sodium bicarbonate in ionic liquids

Chemoselective esterification of phenolic acids with dialkyl sulphates or alkyl halides in the presence of sodium bicarbonate in 1,3-dialkylimidazolium ionic liquids is reported in excellent yields and less reaction time as compared to organic solvents. Copyright Taylor & Francis Group, LLC.

A simple and effective method for chemoselective esterification of phenolic acids

A new method for efficient and chemoselective esterification of phenolic acids in KHCO3/alkyl halide/DMF reaction system is described, by which a series of phenoic acid esters were obtained in excellent yields.