56337-56-5Relevant academic research and scientific papers
Synthesis of new thioxanthenes by organocatalytic intramolecular Friedel–Crafts reaction
Yildiz, Tülay
, p. 2177 - 2188 (2018/07/21)
An efficient organocatalytic route has been developed to synthesize novel substituted thioxanthenes (2a–2v) starting from diaryl thioether alcohols (1a–1v) using the intramolecular Friedel–Crafts reaction. The starting materials were obtained in two stage
A classical but new kinetic equation for hydride transfer reactions
Zhu, Xiao-Qing,Deng, Fei-Huang,Yang, Jin-Dong,Li, Xiu-Tao,Chen, Qiang,Lei, Nan-Ping,Meng, Fan-Kun,Zhao, Xiao-Peng,Han, Su-Hui,Hao, Er-Jun,Mu, Yuan-Yuan
, p. 6071 - 6089 (2013/09/12)
A classical but new kinetic equation to estimate activation energies of various hydride transfer reactions was developed according to transition state theory using the Morse-type free energy curves of hydride donors to release a hydride anion and hydride acceptors to capture a hydride anion and by which the activation energies of 187 typical hydride self-exchange reactions and more than thirty thousand hydride cross transfer reactions in acetonitrile were safely estimated in this work. Since the development of the kinetic equation is only on the basis of the related chemical bond changes of the hydride transfer reactants, the kinetic equation should be also suitable for proton transfer reactions, hydrogen atom transfer reactions and all the other chemical reactions involved with breaking and formation of chemical bonds. One of the most important contributions of this work is to have achieved the perfect unity of the kinetic equation and thermodynamic equation for hydride transfer reactions. The Royal Society of Chemistry.
Syntheses and Reactions of 9-Substituted 10-Phenylthioxanthenium Salts: Negative Evidence for Thia-anthracene Oligomerisation
Hori, Mikio,Kataoka, Tadashi,Shimizu, Hiroshi,Ikemori, Megumi,Aoyama, Yasuko
, p. 1209 - 1218 (2007/10/02)
Various 9-aryl-10-phenylthioxanthenium salts have been prepared and their stereochemistry determined by (1)H n.m.r. spectroscopy.Reactions of the 10-phenylthioxanthenium salts or 10-phenyl-10-thia-anthracenes with aryl-lithiums have been studied in order to investigate whether or not 10-thia-antracenes cause oligomerisation.The 10-phenylthioxanthenium salts reacted with aryl-lithiums to give 9-phenylthioxanthenes in good yields.However, 10-phenylthioxanthenium salt (19) when treated with phenyl-lithium at -15 to -20 deg C gave 9-phenylthioxanthenol (38) (17percent) together with 9-phenylthioxanthene (13) because of the lability of 10-phenyl-10-thia-anthracene to air. 10-Phenyl-9-(p-tolyl)-10-thia-anthracene (50) generated in situ from the sulphonium salt (22) and lithium diisopropylamide failed to react with p-tolyl-lithium.An isolable ylide, 9-benzoyl-10-phenyl-10-thia-anthracene (52) was treated with p-tolyl-lithium at 0 deg C to give 9-benzoylthioxanthene (4) (82percent).In contrast, 9,9,10-triphenylthioxanthenium salt (24) on treatment with phenyl-lithium gave a ring-opened product (40), a ring-contracted product (41), diphenylsulphide (42), and 9,9-diphenylthioxanthene (12).These results indicate that the 10-phenyl-thia-anthracenes or the ?-sulphuranes of thioxanthenes do not cause oligomerisation.
