5875-45-6Relevant articles and documents
Method for synthesizing tert-butylhydroquinone
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Paragraph 0030-0032; 0036-0041, (2021/03/13)
The invention discloses a method for synthesizing tert-butylhydroquinone, and relates to tert-butylhydroquinone. The invention provides a synthesis method of tert-butylhydroquinone, and the method hasthe advantages of simple process and lower cost. The method comprises the following steps: 1) sequentially adding a catalyst sulfamic acid, a solvent toluene or xylene, tert-butyl alcohol, hydroquinone and 1, 4-dioxane into a heatable pressure-resistant reactor for reaction at 120-150 DEG C for 4-12 hours; 2) after the reaction is finished, adding ethanol, filtering to remove the catalyst sulfamic acid, and removing the solvent to obtain a crude product; 3) purifying the crude product obtained in the step 2) to obtain the product tert-butylhydroquinone. The defects that catalysts with high corrosivity are needed in the existing synthesis process, the process cost is high, the environmental pollution is serious, and the reaction selectivity is low are overcome.
Guaiacol demethoxylation catalyzed by Re2O7 in ethanol
Yan, Fei,Sang, Yushuai,Bai, Yunfei,Wu, Kai,Cui, Kai,Wen, Zhe,Mai, Fuhang,Ma, Zewei,Yu, Linhao,Chen, Hong,Li, Yongdan
, p. 231 - 237 (2019/08/12)
Re2O7 is used to convert guaiacol in alcohols at 280–320 °C. In ethanol, guaiacol is deoxygenated and alkylated, and the major products are phenol and alkylphenols (including ethylphenol, diethylphenol, diisopropylphenol, di-tert-butylphenol and 2,6-di-tert-butyl-4-ethylphenol), accounting for 97 mol% of all products after 6 hour reaction at 320 °C. Both catechol and phenol are the intermediates of guaiacol demethoxylation. Among the substituents, ethyl is directly provided by ethanol while isopropyl and tert-butyl are formed by the addition of methyl to ethyl step by step. In addition, Re2O7 has negligible activity for the saturation of benzene ring so it does not cause considerable over-consumption of reductant. The actual catalyst for guaiacol demethoxylation is likely a ReIV?VI species.
Strained Benzene Derivatives by Copper-Catalyzed tert-Butylation
Kuenzer,Hermann,Berger, Stefan
, p. 3222 - 3223 (2007/10/02)
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