2362-16-5Relevant academic research and scientific papers
Synthesis, crystal structure, binding properies of a noncyclic crown-type receptor derived from diethoxycarbonyl glycoluril
Bao-Han, Zhou,Li-Ping, Cao,An-Xin, Wu
, p. 440 - 442 (2009)
A novel noncyclic crown-type diethoxycarbonyl glycoluril derivative receptor was synthesised and its crystal structure was obtained. The study of its binding behaviour towards neutral guests showed that it can bind hydroquinone, resorcinol and catechol.
An experimental and theoretical study on imidazolium-based ionic liquid promoted chloromethylation of aromatic hydrocarbons
Wang, Yun,Xi, Yanli
, p. 2196 - 2199 (2014/03/21)
The chloromethylation of aromatic hydrocarbons proceeded efficiently using the reusable imidazolium-based ionic liquid as promoter. Mild reaction conditions, enhanced rates, improved yields, recyclability of ionic liquids, and reagents' reactivity which is different from that in conventional organic solvents are the remarkable features observed in ionic liquids. The ionic liquids were recycled in three subsequent runs with no decrease in activity. In addition, the results of calculations with the Gaussian 98 suite of program are in good accordance with the experimental outcomes.
Efficient dichloromethylation of some aromatic hydrocarbons catalyzed by a new ionic liquid [C12minPEG800]br under homogeneous catalysis in aqueous media
Hu,Liu,Lu,Lu,Ge,Zhang
experimental part, p. 131 - 141 (2012/01/03)
A series of new imidazolium-type ionic liquids based on polyethylene glycol have been prepared. The new recyclable temperature-dependant phase-separation system comprised of [C12minPEG800]Br and methylcyclohexane was also developed and successfully applied to the dichloromethylation of some aromatic hydrocarbons to prepare dichloromethyl-substituted hydrocarbons in excellent yields. The ionic liquid could be excellent recycled without any apparent loss of catalytic activity and little loss of weight even after 8 times recycling.
An inexpensive and efficient synthetic method for the preparation of pyromellitic dianhydride promoted by ionic liquid
Hu, Yu Lin,Lu, Ming,Liu, Xiao Bin,Zhang, Sheng Bin,Ji, Zhan Hui,Lu, Ting Ting
experimental part, p. 63 - 74 (2010/10/19)
In this article, pyromellitic dianhydride could be successfully obtained in 76.7% total yield by an aerobic oxidation of 1,4-bis(chloromethyl)-2,5- dimethylbenzene or 1,5-bis(chloromethyl)-2,4- dimethylbenzene catalyzed by VO(acac)2/Cu(2-Eth)2/DABCO in [hmim]OTf and a subsequent dehydration of pyromellitic acid upon heating with acetic anhydride. The starting materials including 1,2-bis(chloromethyl)-4,5-dimethylbenzene were prepared by dichloromethylation of their corresponding xylene catalyzed by [C12mim]Br in aqueous media. ARKAT USA, Inc.
Identification of alkylarene chloromethylation products using gas-chromatographic retention indices
Zenkevich,Makarov
, p. 611 - 619 (2008/03/18)
Gas-chromatographic retention indices on standard nonpolar polydimethylsiloxane stationary phases allow identification of products formed by known organic reactions even without using mass-spectrometric data. The efficiency of this approach was demonstrated by the example of identification of previously uncharacterized chloromethyl derivatives of alkylarenes, including structural isomers of compounds containing several chloromethyl groups, directly in reaction mixtures. Chromatographic analysis of such reaction mixtures allows identification of positional isomers of the starting alkylarenes even when they are present simultaneously. The retention indices were determined for the first time for more than 50 alkyl-(chloromethyl)arenes, by-products of chloromethylation, and chloromethyl derivatives of the simplest alkyl phenyl ketones. Nauka/Interperiodica 2007.
The first immobilisation of glycoluril-based molecular clips on silica gel and alumina
Rahimizadeh, Mohammad,Seresht, Esmaeel Rezaei,Bakavoli, Mehdi,Golari, Neda
, p. 525 - 527 (2008/02/13)
The first example of immobilisation of some glycoluril-based molecular clips, which are good receptors for dihydroxybenzenes, on silica gel and alumina is described. 4,4'-Bis(methoxyphenyl)glycoluril was used as the base scaffold for the synthesis of mole
[emim]BF4-promoted chloromethylation of aromatic hydrocarbons
Wang, Yun,Shang, Zhi-Cai,Wu, Tian-Xing
, p. 3053 - 3059 (2007/10/03)
The chloromethylation of aromatic hydrocarbons proceeded efficiently using the reusable ionic liquid [emim]BF4 as promoter. The reactions were completed in 5 h at 70°C with good yields and easy workup. Copyright Taylor & Francis Group, LLC.
Interpretation of retention indices in gas chromatography for establishing structures of isomeric products of alkylarenes radical chlorination
Zenkevich
, p. 270 - 280 (2007/10/03)
By an example of previously uncharacterized products obtained by alkylarenes radical chlorination was demonstrated that combination of various interpretation methods applied to the retention indices (RI) in the gas chromatography on the standard nonpolar phases (comparison of RI of products and initial compounds, characteristics of succession of the chromatographic elution of the structural isomers with the use of estimation of molecular dynamic parameters, application of the additive schemes to RI calculation, and using of structural analogy CH3?Cl for testing the results obtained) permitted unambiguous identification of the structure even without data of mass spectrometry.
