134252-95-2

Upstream product

• 628-89-7 2-(2-Chloroethoxy)ethanol 
• 108-46-3 recorcinol 
• 118591-58-5 5-tosyloxy-3-oxapentanol 
• 134252-96-3 C₂₄H₃₈O₈ 

Downstream Products

• 1282454-48-1 C₂₂H₃₀O₁₀ 
• 1245572-96-6 4,4'-(2,2'-(2,2'-(1,3-phenylenebis(oxy))bis(ethane-2,1-diyl))bis-(oxy)bis(ethane-2,1-diyl))bis(oxy)dibenzaldehyde 
• 1282453-43-3 C₅₂H₅₂O₁₁ 
• 1282453-27-3 C₅₈H₆₄O₁₀ 
• 1282453-16-0 C₅₆H₆₀O₁₀ 

Relevant academic research and scientific papers

DENTAL COMPOSITION WITH HIGH E-MODULUS

The invention relates to a dental composition comprising a resin matrix, a filler matrix in an amount of at least 25 wt.% with respect to the weight of the dental composition, an initiator system, the resin matrix comprising polymerizable monomer(s) compr

A new class of flavonoids bearing macrocyclic polyethers by stereoselective photochemical cycloaddition reaction

A new class of flavonoids bearing cyclic polyethers involving a phenyl ring was conveniently provided by the intramolecular photochemical dimerization of 2-chromonecarboxylic esters. Irradiation of 2-chromonecarboxylate with a polyether tethered at both ends promoted intramolecular [2 + 2] cyclobutane formation leading to 14- to 27-membered cyclic polyethers. The efficiency depended on the substituted position of the phenyl ring, with ortho- and meta-substituted derivatives giving cycloadducts in good chemical yields and quantum efficiencies, whereas the para-derivatives were inert toward photolysis. X-ray crystallographic analysis revealed that the stereochemistry of the macrocyclic cycloadducts exhibited C2-symmetry.

Synthesis of Novel Di Benzo spiro bis-crown-ether

This paper focuses on the synthesis of a wide variety of di benzo spiro bis-crown compounds, in good yields using di-phenols, mono tosylates of oligoethylene glycols and caesium carbonate in acetonitrile.

DENTAL COMPOSITION AND USE THEREOF

The invention relates to a dental composition comprising polymerizable monomer (1), initiator component(s), filler component(s) in an amount of more than about 20 wt.-%, wt.-% with respect to the whole weight of the composition, the polymerizable monomer

Template-directed synthesis of kinetically and thermodynamically stable molecular necklace using ring closing metathesis

We report the template-directed synthesis of a well-defined, kinetically stable [5]molecular necklace with dialkylammonium ion (R2NH 2+) as recognition site and DB24C8 as macrocycle. A thread containing four dialkylammonium ions with olefin at both ends was first synthesized and then subjected to threading with an excess amount of DB24C8 to form pseudo[5]rotaxane, which in situ undergoes ring closing metathesis at the termini with second generation Grubbs catalyst to yield the desired [5]molecular necklace. The successful synthesis of [5]molecular necklace is mainly attributed to the self-assembly and dynamic covalent chemistry which allows the formation of thermodynamically most stable product. The self-assembly of the DB24C8 ring onto the recognition site known as templating effect was driven by noncovalent stabilizing interactions like [N+-H...O], [C-H...O] hydrogen bonds as well as [π...π] interactions which is facilitated in non-polar solvents. The reversible nature of olefin metathesis reaction makes it suitable for dynamic covalent chemistry since proof-reading and error-checking operates until it generates thermodynamically the most stable interlocked molecule. Riding on the success of [5]molecular necklace, we went a step further and attempted to synthesize [7]molecular necklace using the same protocol. This led to the synthesis of another thread with olefin at both ends but having six dibenzylammonium ions along the thread. However, the extremely poor solubility of this thread containing six secondary ammonium ions limits the self-assembly process even after we replaced the typical PF6 - counter anion with a more lipophilic BPh4- anion. Although the poor solubility of the thread remains the bottleneck for making higher order molecular necklaces yet this approach of "threading-followed-by-ring-closing-metathesis" for the first time produces kinetically and thermodynamically stable, well-defined, homogeneous molecular necklace which was well characterized by one-dimensional, two-dimensional, variable temperature proton NMR spectroscopy and ESI mass spectroscopy.

One-pot synthesis of cyclophane-type macrocycles using manganese(iii)- mediated oxidative radical cyclization

Cyclophane-type macrocyclic compounds from 21 to 56 members having two fused dihydrofuran rings were synthesized by the manganese(iii)-mediated oxidation of terminal dienes with bis(3-oxobutanoate)s containing aromatics. The reaction detail, characterization and reaction pathways are described. The Royal Society of Chemistry 2011.

Molecular meccano. 3. Constitutional and translational isomerism in [2]catenanes and [n]pseudorotaxanes

The mutual molecular recognition expressed between two classes of compounds has led to the self-assembly of a range of [2]catenanes, composed of cyclic polyethers intercepted by π-electron donors, and a range of [n]-pseudorotaxanes, composed of similar ac

Mono- and Di(functionally-substituted phenylene) semi-rigid crowns and processes for making

Bis(carboalkoxy-substituted m-phenylene)-32-crown-10 compounds, useful as polymerizable monomers, can be formed in one step by reacting a functionalized dihydroxy aromatic compound with a dihalopolyether. In the same reaction, carboalkoxy-substituted m-phenylene-16-crown-5 is formed. Other mono- and di-functionalized bis(phenylene) crown ethers can be made by one step as well as multistep synthesis from similar starting materials.