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The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《The thermal decomposition of the hydrates, nitrates and oxide of aluminum》. Authors are Parravano, N.; Malquori, G..The article about the compound:Aluminum(III) sulfate xhydratecas:17927-65-0,SMILESS:O=S(O)(O)=O.O=S(O)(O)=O.O=S(O)(O)=O.[H]O[H].[Al].[Al]).Recommanded Product: 17927-65-0. Through the article, more information about this compound (cas:17927-65-0) is conveyed.

Al(NO3)3.6H2O is formed when Al(NO3)3.9H2O is maintained at ordinary temperature over P2O5 in vacuo, or by repeated treatment of Al(NO3)3.9H2O with hot HNO3.H2O. Al(NO3)3.6H2O has already been prepared in other ways (cf. Inamura, Mem. Coll. Sci. Kyoto 4, 105(1919); C. A. 14, 2451). A new hydrate, Al(NO3)3.4H2O, was prepared by maintaining Al(NO3)3.6H2O in contact with excess N2O5 at ordinary temperature for 12 h. It remains unaltered up to 180°, at which temperature it decomposes to Al2O3, N2O5 and H2O. The thermal decomposition curve of Al(NO3)3.9H2O showed breaks at 73.5°, 140° and 200°, corresponding to fusion and conversion to Al(NO3)3.6H2O, to decomposition of the latter to the basic salt, 4Al2O3.3N2O5. 14H2O, and to decomposition of the latter to Al2O3. The curve of AlCl3.6H2O showed breaks at 122° and at 180°, the latter corresponding to decomposition of Al2O3. Al2(SO4)3.18H2O behaves differently. At 105° it becomes anhydrous and at 760° the Al2(SO4)3 decomposes to Al2O3 and SO3. Samples from various sources of Al2O3 containing different proportions of H2O of hydration were then heated, and the curves were compared with those of gibbsite, diaspore and bauxite. The results were complicated and difficult of interpretation but indicate that the breaks in the curve which were observed were caused by the formation of lower hydrates of definite chem. composition and (2) by adsorption phenomena.

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Reference:
Isothiazole – Wikipedia,
Isothiazole – ScienceDirect.com