22915-73-7Relevant articles and documents
Dipole-Dipole Interactions between the Terminal Groups of l,n-Diarenecarboxy Alkanes, n=1, 2, ..., 6
Macanita, Antonio L.,Magalhaes, Jorge,Dias, Antonio,Teles, Henrique,Iglesias, Emilia
, p. 4011 - 4016 (1990)
The mutual interaction between the end groups of bichromophoric molecules is studied using absorption and fluorescence techniques (steady-state and time-resolved).With three series of di-1,n-arenecarboxyalkanes (arene = benzene, naphthalene and anthracene; n = 1,2,3,5 and 6) and a series of 1-pyrenecarboxy, n-(N-methyl, N-phenylamino) alkanes (n = 2,3,4,5,6 and 9), it is found that model compounds such as the methyl, ethyl and hexyl esters of benzene, naphthalene, anthracene and pyrene differ from the bichromophoric compounds in their absorption and emission spectra, molar absorption coefficients and radiative rate constants.These differences decrease with the mean value of the sixth power of the end-to-end distance, being attributed to dipole-dipole interactions between the end groups.The terminal group induces mixing of the lowest excited singlet state with higher energy states and increases the local polarizability of the medium.Two methods for evaluating the unquenched fluorescence lifetimes of bichromophoric compounds are discussed.
Solvent-free synthesis of symmetric methylene diestersviadirect reaction of aromatic carboxylates with 1,n-dihaloalkanes
Bai, Lin,Ding, Shenglong,Ma, Xiaofang
, p. 28711 - 28715 (2021/09/22)
An efficient methodology for the synthesis of symmetrical methylene diesters was developed through direct reaction of various aromatic carboxylates with 1,n-dihaloalkanes under solvent-free conditions. This strategy offers a high product yield, facile work-up and purification, and an environmentally friendly approach to obtain long-chain methylene carboxylate scaffolds with increased diversity.
Metal-free transesterification catalyzed by tetramethylammonium methyl carbonate
Hatano, Manabu,Tabata, Yuji,Yoshida, Yurika,Toh, Kohei,Yamashita, Kenji,Ogura, Yoshihiro,Ishihara, Kazuaki
supporting information, p. 1193 - 1198 (2018/03/27)
Environmentally benign metal-free tetramethylammonium methyl carbonate is effective as a catalyst for the chemoselective, scalable, and reusable transesterification of various esters and alcohols in common organic solvents. In situ-generated highly active species, tetramethylammonium alkoxides, can greatly avoid self-decomposition at ≤110 °C, and are reusable. In particular, chelating substrates, such as amino alcohols, diols, triols, sugar derivatives, alkaloids, α-amino acid esters, etc., which deactivate conventional metal salt catalysts, can be used. A 100 gram scale biodiesel production was also demonstrated.
DBU-Based Dicationic Ionic Liquids Promoted Esterification Reaction of Carboxylic Acid with Primary Chloroalkane Under Mild Conditions
Liu, Yang,Mao, Guijie,Zhao, Hongyan,Song, Jinyi,Han, Huatao,Li, Zhuofei,Chu, Wenyi,Sun, Zhizhong
, p. 2764 - 2771 (2017/09/14)
Abstract: A series of DBU-based (DBU = 1, 8-diazabicyclo [5.4.0] undec-7-ene) dicationic ionic liquids with different anions were successfully synthesized by the reaction of DBU and 1, 6-dichlorohexane. Therein, the dicationic ionic liquid 1, 1′-(hexane-1, 6-diyl)bis(1, 8-diazabicyclo [5.4.0]undec-7-enium) dichlorine (IL-1) was successfully employed as an efficient catalyst in esterification reaction of carboxylic acids with primary chloroalkanes under mild conditions without any additional basic reagents. Moreover, the optimum catalyst could be efficiently reused for five times without any significant change on the catalytic effect. The improved protocol is not only efficient, but also green and pollution-free.
Odd-even effect of dopant molecules on clearing temperatures of nematic liquid-crystal phases
Kishikawa, Keiki,Haga, Yuri,Inoue, Takahiro,Watanabe, Tomohiro,Takahashi, Masahiro,Kohmoto, Shigeo
supporting information, p. 1465 - 1467 (2013/01/16)
Nematic liquid-crystal phases doped with the novel dopant compounds 1 (C6F5COO(CH)nOCOC6F5, n = 17) and 2 (C6H5-COO(CH)nOCOC6H 5, n = 17) showed an "opposite odd-even effect" on clearing temperatures. The tendency was exactly opposite to that reported for liquid-crystal dimers. A mechanism is postulated on the basis of the difference in the formation of molecular aggregations of even- and odd-number-dopant molecules in the host liquid-crystal molecules.
Metabolites from the biodegradation of 1, 6-hexanediol dibenzoate, a potential green plasticizer, by Rhodococcus rhodochrous
Pour, Azadeh Kermanshahi,Mamer, Orval A.,Cooper, David G.,Maric, Milan,Nicell, Jim A.
experimental part, p. 662 - 671 (2010/04/30)
Metabolites from the biodegradation of a potential plasticizer 1, 6-hexanediol dibenzoate in the presence of n-hexadecane as a co-substrate by the common soil organism Rhodococcus rhodochrous were identified using GC/MS and Fourier transform mass spectros
Chemo- and stereoselective monobenzoylation of 1,2-diols catalyzed by organotin compounds
Iwasaki, Fumiaki,Maki, Toshihide,Onomura, Osamu,Nakashima, Waka,Matsumura, Yoshihiro
, p. 996 - 1002 (2007/10/03)
A new facile method for monoacylation of diols has been developed. A variety of cyclic and acyclic diols, in particular 1,2-diols, were selectively monobenzoylated in good yields by the reaction with benzoyl chloride in the presence of a catalytic amount of dimethyltin dichloride and inorganic bases such as potassium carbonate. Furthermore, the method was successfully applied to a kinetic resolution of racemic 1-phenyl-1,2- ethanediol using a chiral organotin catalyst. The ee was dependent on the kind of base, water as an additive, and the reaction temperature.
A new convenient method for selective monobenzoylation of diols
Maki, Toshihide,Iwasaki, Fumiaki,Matsumura, Yoshihiro
, p. 5601 - 5604 (2007/10/03)
A new facile method for monoacylation of diols has been developed. A variety of cyclic and acyclic diols, in particular 1,2-diols, was selectively monobenzoylated in good yields by their reaction with benzoyl chloride in the presence of a catalytic amount of dimethyltin dichloride and inorganic bases.