2786-31-4Relevant articles and documents
Solvent-free synthesis of benzothiazole-based quaternary ammonium salts: Precursors to ionic liquids
Nadeem, Sohail,Munawar, Munawar A.,Ahmad, Saeed,Smiglak, Marcin,Drab, David M.,Malik, Khizar I.,Amjad, Rana,Ashraf, Chaudhry M.,Rogers, Robin D.
, p. 19 - 37 (2010)
A series of 13 benzothiazolium iodide salts have been prepared in solvent-free conditions by optimizing the reaction. An additional 26 benzothiazolium salts with bistrifluoromethanesulfonimide and trifluoromethylsulfonate were prepared via simple metathesis reactions from the iodide precursors. Out of a total of 39 prepared salts, 26 were identified as ionic liquids, with melting points as low as 42 °C observed for dodecylbenzothiazolium bistrifluoromethanesulfonimide. All prepared compounds have been characterized using FTIR, 1H, 13C NMR, and HRMS analyses. The thermal stabilities as well as melting points of these salts were also analyzed.
Base induced synthesis of 4H-1,4-benzothiazines and their computational studies
Preet, Simer,Cannoo, Damanjt Singh
, p. 79232 - 79238 (2015)
A one pot synthesis of 1,4-benzothiazines from 1,3-benzothiazolium cations and α-haloketones through ring expansion under ultrasonication was carried out by employing optimal 5% sodium hydroxide and characterization was done with the help of various spectroscopic techniques viz. NMR, IR and mass spectrometry. Single crystal X-ray diffraction and computational studies of (4-bromophenyl)(4-methyl-4H-benzo[b][1,4]thiazin-2-yl)methanone (3c) were also performed. Different concentrations of different bases (NaOH, Na2CO3, NaHCO3 solutions etc.) were used to obtain 1,4-benzothiazine derivatives. But, the best results were obtained with 5% NaOH solution (3.7 equivalents) for the synthesis of single product 1,4-benzothiazine derivatives while, with other concentrations, the reaction did not proceed to a single product. Quantum chemical calculations were done to find the optimized geometry and to correlate the experimental and calculated values of the bond parametres and 13C NMR chemical shifts of the synthesized compound. The optimized geometry was obtained using density functional theory (DFT) with the basis set 6-31G(d). The theoretical values of the 1H NMR chemical shifts were in agreement with the experimental values. The photophysical properties of some of the synthesized compounds were studied with the help of ultraviolet-visible and fluorescence spectroscopy.
Nigrey,Garito
, p. 451 (1977)
Highly reactive (<1 min) ratiometric probe for selective 'naked-eye' detection of cyanide in aqueous media
Goswami, Shyamaprosad,Manna, Abhishek,Paul, Sima,Aich, Krishnendu,Das, Avijit Kumar,Chakraborty, Shampa
, p. 1785 - 1789 (2013/05/09)
We have designed and synthesized a triphenyl aminebenzothiazole coupled receptor (TBH) that exhibits a selective, sensitive, colorimetric, and ratiometric rapid response toward cyanide anion in aqueous media. The sensing event is explained by spectroscopy along with DFT calculation and CV diagram. Sensor displays a very fast response (- and AcO- in aqueous media.
