153354-46-2Relevant articles and documents
CO2-Catalyzed oxidation of benzylic and allylic alcohols with DMSO
Riemer, Daniel,Mandaviya, Bhavdip,Schilling, Waldemar,G?tz, Anne Charlotte,Kühl, Torben,Finger, Markus,Das, Shoubhik
, p. 3030 - 3034 (2018/04/14)
CO2-catalyzed transition-metal-free oxidation of alcohols has been achieved. Earlier, several methodologies have been explored for alcohol oxidations based on transition-metal catalysts. However, owing to the cheaper price, easy separation and nontoxicity, transition-metal-free systems are in high demand to the pharmaceutical industries. For this reason, various primary and secondary alcohols have been selectively oxidized to the corresponding carbonyl compounds using CO2 as a catalyst in the presence of different functional groups such as nitrile, nitro, aldehyde, ester, halogen, ether, and so on. At the end, transition-metal-free syntheses of pharmaceuticals have also been achieved. Finally, the role of CO2 has been investigated in detail, and the mechanism is proposed on the basis of experiments and DFT calculations.
LIQUID CRYSTAL OLIGOMER, SYNTHESIS COMPOSITION, PREPARATION METHOD THEREOF, AND LIQUID CRYSTAL MATERIAL
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Page/Page column 3, (2012/10/23)
The disclosed technology provides a liquid crystal oligomer, a synthesis composition, a preparation method thereof, and a liquid crystal material. The liquid crystal oligomer is represented by the following chemical formula, wherein substituent R is hydrogen or methyl. In addition to a higher glass transition temperature, good heat resistance, low viscosity and a self-crosslinkable group, the liquid crystal oligomer has thermal self-crosslinking and high thermal stability of thermosetting materials.
New unsymmetrical difluoroaromatic compounds and estimation of their reactivities in nucleophilic substitution
Keshtov, M. L.,Rusanov, A. L.,Keshtova, S. V.,Petrovskii, P. V.,Shchegolikhin, A. A.
, p. 117 - 123 (2007/10/03)
A series of previously unknown unsymmetrical difluoroaromatic compounds, viz., p-fluorobenzoylphenyl(p-fluorophenyl)-substituted imidazoles, pyrazines, and quinoxalines, were synthesized according to multistep procedures with the use of chloral as the key
Phenylethynyl amine
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, (2008/06/13)
Four phenylethynyl amine compounds--3 and 4-aminophenoxy-4'-phenylethynylbenzophenone, and 3 and 4-amino-4'-phenylethynylbenzophenone--were readily prepared and were used to endcap imide oligomers. Phenylethynyl-terminated amide acid oligomers and phenylethynyl-terminated imide oligomers with various molecular weights and compositions were prepared and characterized. These oligomers were cured at 300° C. to 400° C. to provide crosslinked polyimides with excellent solvent resistance, high strength and modulus and good high temperature properties. Adhesive panels, composites, films and moldings from these phenylethynyl terminated imide oligomers gave excellent mechanical performance.
Phenylethynyl endcapping reagents and reactive diluents
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, (2008/06/13)
A composition of matter having the general structure: STR1 (wherein X is F, Cl, or NO2, and Y is CO, SO2 or C(CF3)2) is employed to terminate a nucleophilic reagent, resulting in the exclusive production of phenylethynyl terminated reactive oligomers which display unique thermal characteristics. A reactive diluent having the general structure: STR2 (wherein R is any aliphatic or aromatic moiety) is employed to decrease the melt viscosity of a phenylethynyl terminated reactive oligomer and to subsequently react therewith to provide a thermosetting material of enhanced density. These materials have features which make them attractive candidates for use as composite matrices and adhesives.
