6313-34-4Relevant articles and documents
Sodium 4-Hydroxy-3-nitrobenzenesulfonate Trihydrate
Squattrito, Philip J.
, p. 1282 - 1284 (1995)
The title compound, Na+*C6H4NO6S-*3H2O, crystallizes in double layers with the nearly planar organic anions oriented parallel to one another and the sulfonate groups directed towards the center of the sandwich, where they are bonded to Na+ cations.Each Na+ cation bonds to six O atoms in a distorted octahedral geometry.The coordination sphere contains two sulfonate O atoms, one nitro O atom from a different anion and three water molecules.There are hydrogen bonds involving the water molecules, the sulfonate O atoms and the hydroxyl groups.
Method for preparing sodium 3-nitrobenzene sulfonate and derivative thereof through chlorosulfonic acid sulfonation
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Paragraph 0077; 0078; 0079; 0080; 0081, (2019/01/07)
The invention discloses a method for preparing sodium 3-nitrobenzene sulfonate and a derivative thereof through chlorosulfonic acid sulfonation. The method comprises the following steps: 1) putting anitrobenzene raw material and chlorosulfonic acid into a reaction container, heating to 90-150 DEG C, keeping the temperature, carrying out a sulfonation reaction, and discharging a hydrogen chloridegas generated in the reaction process outside the reaction system in time, wherein the mole ratio of the nitrobenzene raw material to the chlorosulfonic acid is 1:(0.4-0.6); 2) carrying out aftertreatment on the reaction liquid obtained in the step 1) by using soda, thereby obtaining the sodium 3-nitrobenzene sulfonate or the derivative thereof. By adopting the method, a reverse thinking mode is adopted, the amount of the chlorosulfonic acid is reduced till being smaller than that of the nitrobenzene, and then the small amount of the chlorosulfonic acid can be converted by using the excessiveamount of the nitrobenzene; therefore, the method disclosed by the invention has no problem of treating residual chlorosulfonic acid; in addition, the excessive nitrobenzene can be easily recycled andcirculated, the hydrogen chloride as a byproduct can be also easily separated and recycled.
Kinetics and mechanism of aminolysis of phenyl acetates in aqueous solutions of poly(ethylenimine)
Arcelli, Antonio,Concilio, Carlo
, p. 1682 - 1688 (2007/10/03)
Second-order rate constants (kn) for the aminolysis of some phenyl acetates with poly(ethylenimine) (PEI) were obtained in a pH range 4.36-11.20 at 25 °C in 1 M KC1. Linear Bronsted-type plots (log kn vs pKN of PEI) were found for less reactive esters 2-nitrophenyl acetate, 4-acetoxy-3-chlorobenzoic acid, and 4-acetoxybenzenesulfonate with slopes of 0.92, 0.99, and 0.82, respectively. Curved plots were obtained for 3-acetoxy-2,6-dinitrobenzoic acid and 4-acetoxy-3-nitrobenzene-sulfonate, which are consistent with a stepwise reaction. The most likely mechanism involves the existence of a tetrahedral intermediate (T±) and a change in the rate-determining step from its breakdown to its formation when the basicity of the polyamine increases. A semiempirical equation was used to calculate the values of limiting slopes of the plots (0.9 and 0.1 for both esters) and pKN at the center of the curvature of the plots (p-KN° = 7.94 and 9.02, respectively). The values of pKN° are lower than those estimated for the aminolysis of the same esters with simple monomeric amines (pKn° > 11) because of a better leaving ability of the aryl oxide ion from the tetrahedral intermediate when amino groups of PEI instead of simple amines are involved. Estimation of the pK's of the reactive intermediates and of the microscopic rate constants for the proton transfer from T± to PEI or from PEIH+ to T± indicates that either base or acid catalysis is unimportant in the aminolysis of these esters by PEI.
