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Citation: LI Fei, JIANG Heng, ZHAO Shanlin, LI Ping. Product Analysis and Reaction Mechanism of High-Pressure Synthesis of Sulfurized Isobutylene by One-Step Method[J]. Chinese Journal of Applied Chemistry, ;2015, 32(7): 771-776. doi: 10.11944/j.issn.1000-0518.2015.07.140397 shu

Product Analysis and Reaction Mechanism of High-Pressure Synthesis of Sulfurized Isobutylene by One-Step Method

1.
School of Chemistry and Materials Science, Liaoning Shihua University, Fushun, Liaoning 113001, China

Corresponding author: ZHAO Shanlin,
Received Date: 18 November 2014
Available Online: 2 March 2015
Fund Project: 国家自然科学基金(21171083)资助项目 (21171083)

Sulfurized isobutylene was prepared from sulfur and isobutylene via high pressure one-step method at 160~190℃ with n-octylamine as catalyst.GC,FT-IR and ¹H NMR analyses of the final products show that it contains chain-like and cyclic polysulfides,chain-like polysulfides are main products,accompanied with the byproducts 4-methyl-3H-1,2-dithiole-3-thione (MDTT),tert-butyl mercaptan,and a small amount of exhaust gas such as H₂S.The formation of MDTT and H₂S is the result of the hydrogen abstraction reaction from isobutylene catalyzed by alkali in the sulfurization process.H₂S then reacts with isobutylene by Markovnikov addition to the formation of tert-butyl mercaptan which is converted to linear polysulfides by reaction with sulfur.
- sulfurized isobutylene,
- methyl-3H-dithiole-thione,
- chain-like tert-butyl polysulfides,
- reaction mechanism
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