In an 1890 report, British chemists at the Whitehall Soap Works in Leeds noted that dilution seemed to make the smell worse and described the smell as "fearful". In 1889, an attempt to distill the chemical in the German city of Freiburg was followed by cases of vomiting, nausea, and unconsciousness in an area with a radius of 0.75 kilometres (0.47 mi) around the laboratory due to the smell. Like many low molecular weight organosulfur compounds, the smell is potent and can be detected even when highly diluted. The cyclic trimer of thioacetone (trithioacetone) is a white or colorless compound with a melting point of 24 ☌ (75 ☏), near room temperature. Polymerization is promoted by free radicals and light. The polymer melts in the range of about 70 ☌ to 125 ☌. The mean molecular weight of the polymer varies from 2000 to 14000 depending on the preparation method, temperature, and presence of the thioenol tautomer. The 1H NMR spectra shows a single peak at x = 8.1. Infrared absorption of this product occurs mainly at 2950, 2900, 1440, 1150, 1360, and 1375 cm −1 due to the geminal methyl pairs, and at 1085 and 643 cm −1 due to the C–S bond. Unlike its oxygen analogue acetone, which does not polymerise easily, thioacetone spontaneously polymerizes even at very low temperatures, pure or dissolved in ether or ethylene oxide, yielding a white solid that is a varying mixture of a linear polymer
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |