1712-74-9Relevant articles and documents
Chemical equilibria study of the reacting system of the alkyl cumyl ether synthesis from n-alkanols and α-methylstyrene
Verevkin,Heintz
, p. 41 - 46 (2001)
Tremendous growth was observed in the 1990s in the use of oxygenates based on ethers such as MTBE and TAME. However, there has been a growing concern over the last years due to the contamination of groundwater by MTBE, because of the leaking storage tanks and pipelines. Thus, seeking for an alternative additives remains a significant problem. Further candidates for additives are alkyl cumyl ethers synthesized in the liquid phase over acid-functionalized ion-exchanged resin catalysts from n-alkanols and α-methylstyrene. The chemical equilibrium of the reactive systems n-alkanol + α-methylstyrene ? alkyl cumyl ether (alkyl is ethyl, propyl, and butyl) was investigated in the liquid phase at 300-383 K using a cation exchanger as heterogeneous catalyst. Enthalpies of reactions of alkyl cumyl ether synthesis in the liquid phase were obtained from the temperature dependence of thermodynamic equilibrium constant and agreed well with those reaction enthalpies derived from the values of standard molar enthalpies of formation in the liquid phase of ethyl cumyl ether by combustion calorimetry. The standard molar enthalpies of vaporization of alkyl cumyl ethers were obtained from the temperature dependence of the vapor pressure measured by using the transpiration method.
N -Arylbenzo[ b ]phenothiazines as Reducing Photoredox Catalysts for Nucleophilic Additions of Alcohols to Styrenes: Shift towards Visible Light
Seyfert, Fabienne,Wagenknecht, Hans-Achim
supporting information, p. 582 - 586 (2021/01/25)
N -Phenylphenothiazines are an important class of photoredox catalysts because they are synthetically well accessible, they allow the tuning of the optoelectronic properties by different substituents, and they have strong reduction properties for activation of alkenes. One of the major disadvantages of N -phenylphenothiazines, however, is the excitation at 365 nm in the UV-A light range. We synthesized three differently dialkylamino-substituted N -phenylbenzo[ b ]phenothiazines as alternative photoredox catalysts and applied them for the nucleo philic addition of alkohols to α-methyl styrene. The additional benzene ring shift the absorbance bathochromically and allows performing the photocatalyses by excitation at 385 nm and 405 nm. This type of photoredox catalysis tolerates other functional groups, as representatively shown for alcohols as substrates with C-C and C-N triple bonds.
INFLUENCE OF SOLVENTS ON THE KINETICS OF THE HETEROLYSIS OF α,α-DIMETHYLBENZYL CHLORIDES I. HETEROLYSIS OF tert-CUMYL CHLORIDE IN BINARY MIXTURES
Amelichev, V. A.,Saidov, G. V.
, p. 164 - 168 (2007/10/02)
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