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CAS No. : | 98-71-5 | MDL No. : | MFCD00025097 |
Formula : | C6H8N2O3S | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | IOMZCWUHFGMSEJ-UHFFFAOYSA-N |
M.W : | 188.20 | Pubchem ID : | 66825 |
Synonyms : |
|
Chemical Name : | 4-Hydrazinylbenzenesulfonic acid |
Signal Word: | Warning | Class: | |
Precautionary Statements: | P261-P280-P305+P351+P338-P304+P340-P405-P501 | UN#: | |
Hazard Statements: | H302-H315-H319-H335 | Packing Group: | |
GHS Pictogram: |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
82% | With hydrogenchloride; In ethanol; water; at 20℃; for 8h;Heating / reflux; | To a stirred suspension of p-hydrazino-benzenesulfonic acid (42 g, 0.223 mol) in ethanol (450 ml) 6N hydrochloric acid (74 ml, 0.446 mol) was added at room temperature, followed by addition of 4,4,4-trifluoro-l-(4-methyl-phenyl)-butane-l,3- dione (51.45 g, 0.223 mol). The obtained suspension was refluxed for 8 h, then concentrated in vacuo. The residue was dissolved in water (300 ml) and extracted with ethyl acetate (2 x 200 ml). The combined organic layers were washed with water (1 x 100 ml) and brine (1 x 100 ml), dried over MgSO4, decolorized, filtered and concentrated in vacuo. The obtained crystalline product was recrystallized from diisopropyl ether (300 ml) to yield 70.12 g (82 percent) of the title compound. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
83% | Example 8. Preparation of 2,3-dimethyl-3-(4-carboxybutyl)-5-sulfoindolenyne, potassium salt (compound 8) A mixture of phenylhydrazine-p-sulphonic acid (compound 7) (1.8 g; 9.7 mmole), 6-methyl-7-oxooctane acid (compound 5) (2.0 g; 11.6 mmole), and glacial acetic acid (15 mL) was refluxed under stirring for 8 h, then an additional amount of acetic acid was added and treated with activated carbon. The solvent was removed and the residue was dissolved in methanol (10 mL). To solution obtained, there are added dropwise the solution of potassium hydroxide (600 mg; 10,56 mmole) in methanol (7 mL), isopropyl alcohol (15 mL), and diethyl ether (2 mL). The precipitate formed was collected by filtration and dried in vacuum desiccator over P2O5. 2,3-Dimethyl-3-(4-carboxybutyl)-5-sulfoindolenyne, potassium salt (compound 8) was obtained with yield of 3.47 g (83%), λmax 258 nm. Mass-spectrum (MALDI) (C15H19NO5S): found m/z 327.2, calculated m/z 325.38. 1H-NMR (D2O), δ (ppm): 0.45-0.7 (2H, m, CH2CH2CH2CH2COOH); 1.31 (3H, s, 3-CH3); 1.36 (2H, m, CH2CH2CH2CH2COOH); 1.88-2.14 (4H, m, CH2CH2CH2CH2COOH); 7.53 (1H, d, ArH), 7.8 (2H, m, ArH) |
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