1464-96-6Relevant academic research and scientific papers
Acridine-based fluorophores with improved lightfastness properties
Baig Moghal, Zubair Khalid,Manivannan, Ramalingam,Son, Young-A
, (2021/11/11)
9-arylated acridine-based derivatives (AUPAO & AUEA) with high visibility, fluorescence, and excellent lightfastness were synthesized in good yield. The molecules were characterized by 1H NMR, 13C NMR, HRMS and further investigated f
Construction of Esters through Sulfuryl Fluoride (SO 2 F 2) Mediated Dehydrative Coupling of Carboxylic Acids with Alcohols at Room Temperature
Qin, Hua-Li,S Alharbi, Njud,Wang, Shi-Meng
, p. 3901 - 3907 (2019/10/11)
A facile method for the construction of esters through dehydrative coupling of carboxylic acids with alcohols is developed. The reactions are mediated by sulfuryl fluoride (SO 2 F 2) at room temperature and proceed with high efficiency. The method has several advantages including broad substrate scope, mild conditions, excellent functional group compatibility and affords high yields, even on gram scale.
Synthesis and optical properties of trioxatriangulenium dyes with one and two peripheral amino substituents
Sorensen, Thomas J.,Laursen, Bo W.
experimental part, p. 6182 - 6190 (2010/11/18)
Figure presented. Several derivatives of two new dye systems, with one or two dialkylamino donor groups attached to resonant positions at the periphery of a trioxatriangulenium ion, were synthesized. The mono- and bis-dialkylamino trioxatriangulenium salts (A1-TOTA+ and A 2-TOTA+) were prepared from methoxy-substituted triphenylmethylium (TPM) compounds by aromatic nucleophilic substitution with secondary amines and subsequent intramolecular ring closure. The optical properties of the new triangulenium dyes and their TPM precursors were investigated and compared to those of known TPM and xanthenium dyes. The optical properties were found to be dependent on symmetry and charge localization in the conjugated framework. The trioxatriangulenium dye with two amino groups (A2-TOTA+) was found to be a strong fluorophore with properties as a blue-shifted rhodamine B. The mono-substituted compound (A 1-TOTA+) was found to be only weakly fluorescent. We assign the weak fluorescence of A1-TOTA+ to an efficient but reversible formation of a nonfluorescent conformation in the excited state, favored by the large degree of charge localization in this dye with only one donor group.
Efficient esterification of carboxylic acids and phosphonic acids with trialkyl orthoacetate in ionic liquid
Yoshino, Tomonori,Imori, Satomi,Togo, Hideo
, p. 1309 - 1317 (2007/10/03)
An operationally simple, inexpensive, efficient, and environmentally friendly esterification of various carboxylic acids, phosphonic acids, and phosphinic acids with triethyl orthoacetate or trimethyl orthoacetate under neutral conditions in a typical room temperature ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate, was successfully carried out to provide the corresponding ethyl esters or methyl esters in high yields.
Environmentally friendly esterification of carboxylic acids with triethyl orthoacetate in ionic liquid
Yoshino, Tomonori,Togo, Hideo
, p. 1604 - 1606 (2007/10/03)
An operationally simple, inexpensive, efficient, and environmentally friendly esterification of carboxylic acids with triethyl orthoacetate under neutral conditions in a typical room temperature ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate, was carried out to provide the corresponding ethyl esters in high yields.
REAGENTS AND SYNTHETIC METHODS 21. THIONYL CHLORIDE/4-(N,N-DIMETHYLAMINO)PYRIDINE COMPLEX. A SIMPLE ONE-POT METHOD FOR ESTERIFICATION OF CARBOXYLIC ACIDS.
Arrieta, A.,Garcia, T.,Palomo, C.
, p. 1139 - 1146 (2007/10/02)
Esters are obtained by a one-pot method, in which the carboxylic acid is first converted into its acyl chloride by means of thionyl chloride/4-(N,N-dimethylamino)pyridine complex as a new activating reagents.
