38340-11-3Relevant academic research and scientific papers
Enantioselective Resolution Copolymerization of Racemic 2,3-Disubstituted cis-Epoxides with CO2 Mediated by Binuclear Cobalt(III) Catalyst?
He, Guang-Hui,Liu, Yan-Lan,Liu, Ye,Lu, Xiao-Bing
, p. 2386 - 2390 (2021/07/12)
Enantioselective resolution copolymerization of racemic internal epoxides with carbon dioxide (CO2) is a challenging issue because of their poor reactivity and complicated regio/stereoselectivity. Herein, we describe the first enantioselective
Regiospecific ortho-C?H Allylation of Benzoic Acids
Trita, A. Stefania,Biafora, Agostino,Pichette Drapeau, Martin,Weber, Philip,Goo?en, Lukas J.
supporting information, p. 14580 - 14584 (2018/03/13)
A carboxylate-directed ortho-C?H functionalization has been developed and it allows the regiospecific introduction of allyl residues to benzoic acids. In the presence of a [Ru(p-cymene)Cl2]2 and K3PO4, benzoic acids react with allyl acetates at only 50 °C to give the corresponding ortho-allylbenzoic acids. The protocol is generally applicable to both electron-rich and electron-poor benzoic acids in combination with linear and branched allyl acetates. The products can be further functionalized in situ, for example, by double-bond migration, lactonization, or decarboxylation.
Synthesis and mesomorphic properties of laterally fluorinated alkyl 4′′-alkylterphenyl-4-yl carbonate liquid crystals
Choluj, Artur,Kula, Przemyslaw,Dabrowski, Roman,Tykarska, Marzena,Jaroszewicz, Leszek
, p. 891 - 900 (2014/01/23)
Fifteen series of homologues of a variety of mono-, di- and trifluorosubstituted alkyl 4′′-alkylterphenyl-4-yl carbonates have been synthesized and their mesomorphic properties have been determined. From among 95 prepared compounds, 40 pure nematogens have been found, as well as 55 mesogens with orthogonal and tilted smectic phases in broad temperature ranges. The type and combination of the LC phase strongly depend on the position and number of the fluorine atoms. Physical properties and correlations between the molecular core fluorosubstitution, the length of the terminal chains and the type and sequence of the liquid crystalline phases, have been determined. The compounds are useful for the formulation of nematic mixtures as well as ferroelectric ones.
Liquid crystal carbonate and liquid crystal medium containing the same with positive or negative dielectric anisotropy
-
Paragraph 0040, (2013/03/26)
A novel liquid crystalline carbonate and the mixture containing the same: wherein R3 is an alkyl (H2n+1Cn) or an alkenyl (H2n?1Cn) group, each of 1 to 12 carbon atoms, the ring A is laterally unsubstituted benze
KINETICS OF ISOMERIZATION OF ALLYLBENZENE AND ITS DERIVATIVES
Polkanov, M. A.,Shapiro, I. O.,Chernoplekova, V. A.,Shatenshtein, A. I.
, p. 1123 - 1127 (2007/10/02)
The kinetics of isomerization with migration of the double bond in allylbenzene and its derivatives were measured in the lithium tert-butoxide-N,N-dimethylacetamide and potassium tert-butoxide-tert-butyl alcohol catalytic systems.The composition of the catalytically active particles in these solvents was established.The dependence of the isomerization rate of substitued allylbenzenes on the position and electronic chracteristics of the substituents is described by the Hammett equation.The effects of substituents and the characteristics of the catalytic systems on thekinetics of the ionization of substituted toluenes and the isomerization of substituted allylbenzenes are similar.It is concluded that these reactions have a common mechanism.
