Clean-Chemistry Sulfonation of Aromatics

2002 ◽  
Vol 2002 (7) ◽  
pp. 326-327 ◽  
Author(s):  
Brian W. Corby ◽  
Anthony D. Gray ◽  
Padraig J. Meaney ◽  
Michael J. Falvey ◽  
Gregory P. Lawrence ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Trifluoroacetic Acid ◽  
Trifluoroacetic Anhydride ◽  
Phase System

A solution of TFAA/H2SO4 is an atom-efficient liquid-phase system for rapid sulfonation of aromatic structures; H2SO4 is consumed stoichiometrically and the spent trifluoroacetic anhydride (TFAA) is readily recovered as trifluoroacetic acid (TFA) which can be recycled to TFAA.

ChemInform Abstract: Future of Nano-/Hierarchical Zeolites in Catalysis: Gaseous Phase or Liquid Phase System

ChemInform ◽  
2015 ◽  
Vol 46 (17) ◽  
pp. no-no
Author(s):  
Yueer Yan ◽  
Xiao Guo ◽  
Yahong Zhang ◽  
Yi Tang
Keyword(s):  
Liquid Phase ◽  
Gaseous Phase ◽  
Phase System ◽  
Hierarchical Zeolites

Two-film effects on the kinetics of hydrogen isotope exchange between CHCl3 and D2O in two liquid phase system

1993 ◽  
Vol 25 (5) ◽  
pp. 363-374
Author(s):  
Matae Iwasaki ◽  
Tetsuo Sakka ◽  
Shigeyuki Ohashi ◽  
Yoshikazu Miyake ◽  
Hiroshi Matsushita
Keyword(s):  
Liquid Phase ◽  
Hydrogen Isotope ◽  
Isotope Exchange ◽  
Phase System ◽  
Hydrogen Isotope Exchange ◽  
Kinetics Of

Optimisation Of The Kinetics Of The Stereoselective Reduction Of Geraniol To Citronellol In A Two Liquid Phase System

1998 ◽  
Vol 16 (1) ◽  
pp. 27-44 ◽  
Author(s):  
S. D. Doig ◽  
A. T. Boam ◽  
D. J. Leak ◽  
A. G. Livingston ◽  
D. C. Stuckey
Keyword(s):  
Liquid Phase ◽  
Phase System ◽  
Stereoselective Reduction ◽  
Kinetics Of

N,N-Dialkyl-N′-Chlorosulfonyl Chloroformamidines in Heterocyclic Synthesis. Part XIII. Cleavage and Rearrangement Reactions of Pyrazolo[1,5-b][1,2,4,6]thiatriazine 1,1-Dioxides

2016 ◽  
Vol 69 (1) ◽  
pp. 61 ◽  
Author(s):  
Rebecca E. Norman ◽  
Michael V. Perkins ◽  
Andris J. Liepa ◽  
Craig L. Francis
Keyword(s):  
Ethyl Acetate ◽  
Dimethyl Sulfoxide ◽  
Trifluoroacetic Acid ◽  
Sulfonic Acid ◽  
Trifluoroacetic Anhydride ◽  
Ring Cleavage ◽  
Thermal Rearrangement ◽  
Heterocyclic Synthesis ◽  
Similar Treatment ◽  
Catalytic Hydrogenolysis

Treatment of pyrazolo[1,5-b][1,2,4,6]thiatriazines 1 with the Vilsmeier–Haack reagent afforded pyrazolo[1,5-a][1,3,5]triazines 5. Reaction of compounds 1 with trifluoroacetic anhydride, dimethyl sulfoxide, and triethylamine afforded 5-dimethylsulfanylidene derivatives 8. The guanidino-pyrazole-sulfonic acid 9 was produced from treatment of compounds 1 with trifluoroacetic acid under anhydrous conditions. Similar treatment in the presence of water afforded the desulfonated pyrazolo-guanidine 6. Reactions of 6 with one-carbon electrophiles provided various 4-substituted pyrazolo[1,5-a][1,3,5]triazines 5. Attempted catalytic hydrogenolysis of N7-benzyl pyrazolo[1,5-b][1,2,4,6]thiatriazines 2 in alcohols led to sulfamates 12 from thiatriazine ring cleavage. Ethyl acetate or tert-butanol as solvent allowed successful debenzylation to provide compounds 1. Aminolysis of compounds 2 gave sulfamides 13. Thermal rearrangement of compounds 2 afforded 6-benzyl-pyrazolo[3,4-e][1,2,4]thiadiazines 14.

Effect of organic solvents and ionic liquids on resolution of 2-epoxyhexane by whole cells ofRhodotorula glutinisin a two-liquid phase system

2013 ◽  
Vol 89 (4) ◽  
pp. 522-527 ◽  
Author(s):  
Michiaki Matsumoto ◽  
Takashi Sugimoto ◽  
Yudai Ishiguro ◽  
Hiroyuki Yamaguchi ◽  
Kazuo Kondo
Keyword(s):  
Ionic Liquids ◽  
Liquid Phase ◽  
Organic Solvents ◽  
Phase System ◽  
Whole Cells
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