Sulfonation of arylamines : Part VII-Kinetics of thermal decomposition of tetramethyldianilinium sulfates

590-59

Solid state synthesis of ring-substituted aminobenzenesulphonic acids

1556-1560 Treatment of 2-methoxyaniline and 3,5-dichloroaniline with conc.H2SO4 in 2:1 molar ratio at RT affords the corresponding sulphate salts. These salts have been characterized by X-ray diffraction and spectral analyses. Both these salts are found to form ring substituted aminobenzenesulphonic acids in solid state, via proton transfer, under thermal and microwave irradiations

Sulfonation of arylamines: Part II-Preparation and thermal decomposition of ring-substituted arylammonium hydrogen sulfates

229-232<span style="font-size:14.5pt;mso-bidi-font-size:8.5pt; font-family:" times="" new="" roman";mso-fareast-font-family:"times="" roman";="" mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">Eight ring-substituted aryl ammonium hydrogen sulfates (RSAHS) have been prepared by reacting corresponding arylamine with excess of conc. H<span style="font-size:11.5pt;mso-bidi-font-size:5.5pt;font-family:Arial;mso-fareast-font-family: " times="" new="" roman";mso-ansi-language:en-us;mso-fareast-language:en-us;="" mso-bidi-language:ar-sa"="">2<span style="font-size:14.5pt; mso-bidi-font-size:8.5pt;font-family:" times="" new="" roman";mso-fareast-font-family:="" "times="" roman";mso-ansi-language:en-us;mso-fareast-language:en-us;="" mso-bidi-language:ar-sa"="">SO4<span style="font-size:11.5pt; mso-bidi-font-size:5.5pt;font-family:Arial;mso-fareast-font-family:" times="" new="" roman";="" mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">. Their thermal decomposition has been investigated by TG and DSC techniques. The decomposition pathways have also been suggested.</span

Sulfonation of arylamines Part 9 - Solid state synthesis of <span style="mso-bidi-font-style:italic">di<i>-ortho </i>ring substituted <span style="font-size:12.0pt;font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman";mso-ansi-language:EN-IN;mso-fareast-language: EN-IN;mso-bidi-language:AR-SA" lang="EN-IN">aminobenzenesulfonic acids</span></span>

1114-1117Di-ortho ring substituted arylammonium sulfates (Di-o-RSAS) have been prepared from the corresponding arylamines by treatment with cone. H2SO4 and characterized by elemental, gravimetric and spectral analyses. These sulfates yield the corresponding ring substituted aminobenzenesulfonic acids (RSABSA) when subjected to thermal energy. Non-isothermal gravimetric studies on di-o-RSAS support the formation of RSABSA. It is observed that most of the salts undergo transformation to acid in solid state via proton transfer reaction prior to sulfonation.</span

<span style="font-size:11.0pt;line-height:115%; font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family: "Times New Roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font: minor-latin;mso-bidi-font-family:"Times New Roman";mso-ansi-language:EN-US; mso-fareast-language:EN-US;mso-bidi-language:AR-SA">Sulfonation of arylamine Part-5 : Preparation and thermal decomposition of di-<i style="mso-bidi-font-style: normal">m</i>-chloroanilinium sulfate</span>

334-338<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";mso-ansi-language:en-us;="" mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">White crystalline solid of di-m-chloroanilinium sulfate (di-m-CIAS) was obtained when m-chloroaniline and cone sulfuric acid were mixed together in the ratio of 1:1 or 2: 1 at room temperature. Thermal decomposition of di-m-C1AS gave two isomeric chloro aminobenzene sulfonic acids (sulfonated products) and kinetics for the same was evaluated using both isothermal and non-isothermal TG data. Di-m-C1AS seems to decompose by N-H bond heterolysis prior to sulfonation.</span

Synthesis, characterization and thermal decomposition of di-(2,4,6-trimethylanilinium) sulphate

305-310Di-(2,4,6-trimethylanilinium) sulphate [2,4,6-TMAS] was synthesized by reaction of 2,4,6-trimethylaniline with concentrated sulphuric acid at room temperature. The crystal structure of this salt was determined using single crystal X-ray diffraction. It crystallizes in orthorhombic space group Pna21, a= 7.7115(1) Å, b= 30.3746 (6) Å, c=16.9251 (3)Å , ==[°]=90°, V=3964.43 (12)A and Z=8. The structure contains 2,4,6-trimethylanilinium ions that share vertices through intermolecular H- bonds with sulphate ions and a water molecule. Notably thermal and microwave heatings of di-(2,4,6-TMA)S have afforded 3-amino-2,4,6-trimethylbenzenesulphonic acid (3-A-2,4,6-TMBSA) with release of a molecule of amine and water. It has been suggested that the proton transfer from anilinium to SO42- ion is a primary and rate controlling step. Further di-(2,4,6-TMA)S and 3-A-2,4,6-TMBSA were characterized by infrared, mass spectrometry, elemental and thermogravimetric- differential scanning calorimetric (TG-DSC) analyses. The mean value for the energy of activation (83.0 kJ mol-1) for the conversion of di-(2,4,6-TMA)S to 3-A-2,4,6-TMBSA has been determined from isothermal thermogravimetry data

Studies on Energetic Compounds— Part Nineteen: Preparation and Thermolysis of N-Methylanilinium and N,N-Dimethylanilinium Nitrates and Perchlorates

575-582Nitrates and perchlorates salts of N-methylaniline and N,N-dimethylaniline have been prepared and characterised. Thermal and explosive characteristics of these salts are studied by TG, DSC, DTA, DTG and ignition delay measurements. Although the kinetics of thermolysis of these salts were evaluated by fitting TG data in nine mechanism-based kinetic models but the parabolic law gives the best fits. Slow thermolysis involves proton transfer and rapid thermolysis leads to ignition to yield gaseous products

Preparation, crystal structure and thermal decomposition of phenylenediammonium dichloride salts

1277-1282Phenylene-1,2-diammonium dichloride (P-1,2-DADCl), phe¬nylene-1,3-diammonium dichloride (P-1,3-DADCl), phenylene-1,4-diammonium dichloride (P-1,4-DADCl) and 5-carboxyl-phe¬nylene-1,3-diammonium dichloride (5-carboxyl-P-1,3-DADCl) salts have been prepared and characterized by elemental, spectral, gravimetric and X-ray crystallography. Thermal decomposition of these salts has been studied by TG and DSC and shows involvement of proton transfer as a primary step. Kinetic analysis of TG data has been evaluated by model fitting method and model free isoconversional methods

Studies on (non) energetic compounds (Part 22) - Preparation and thermal decomposition of ring substituted arylammonium fluorides

229-235<span style="font-size: 13.0pt;mso-bidi-font-size:8.0pt;font-family:" times="" new="" roman","serif""="">Ring substituted arylammonium fluorides (RSAF) have been prepared and characterised. The thermal decomposition of these salts has been investigated by thermoanalytical techniques and kinetic parameters are evaluated. The thermal decomposition pathways have also been proposed.<span style="font-size:16.0pt; mso-bidi-font-size:11.0pt"> </span

Studies on energetic compounds Part 9: Preparation and thermal decomposition of 1- and 2-naphthylammonium nitrates and perchlorates

140-144<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";mso-ansi-language:en-us;="" mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">1- and 2-naphthylammonium nitrates and perchlorates have been prepared and characterized. Thermal and explosive characteristics of these salts are studied by TG, DSC and ignition delay measurements. Suitable decomposition pathways have also been proposed.</span