56706-10-6Relevant articles and documents
Preparation method of bis-[3-(triethoxy silicon)-propyl]-disulfide
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Paragraph 0022-0059, (2021/06/09)
The invention discloses a preparation method of bis-[3-(triethoxy silicon)-propyl]-disulfide, relates to the technical field of silane coupling agent synthesis, and in particular relates to a preparation method of bis-[3-(triethoxy silicon)-propyl]-disulfide. The preparation method comprises the following steps: step 1, reacting potassium hydroxide with water to prepare a potassium hydroxide solution; step 2, adding potassium carbonate and powdered sulfur into the potassium hydroxide solution, and reacting to obtain a potassium disulfide solution; step 3, adding a phase transfer catalyst into the potassium disulfide solution, then dropwise adding 3-chloropropyltriethoxysilane, and carrying out a reaction so as to obtain bis-[3-(triethoxy silicon)-propyl]-disulfide; the molar ratio of the potassium hydroxide to the potassium carbonate to the sulfur powder to the 3-chloropropyltriethoxysilane is (1.2-1.5) : (0.3-0.6) :(1.2-1.8) : 1. The method has the positive effects of avoiding the generation of hydrogen sulfide gas, being simple in post-treatment, being green and environment-friendly, and improving economic benefits.
Sulfur-modified SBA-15 supported amorphous palladium with superior catalytic performance for aerobic oxidation of alcohols
Liu, Kun,Chen, Zhaoxiang,Hou, Zhiqiang,Wang, Yuanyuan,Dai, Liyi
, p. 935 - 942 (2014/06/23)
A series of sulfur-modified SBA-15 supported amorphous palladium catalysts are prepared, and the effects of preparation parameters on the aerobic oxidation of benzyl alcohol are systematically investigated. The optimal catalyst exhibits remarkably enhanced catalytic activity (conversion 100 % and selectivity 99 %) and could be separated conveniently. The catalysts are characterized by X-ray diffraction patterns, BET, ICP, X-ray photoelectron spectroscopy, CO chemisorption and transmitting electron microscopy, and the results show that disulfur bond framework in the optimal catalyst act as both a stable linker and a good chelator for Pd species. Pd2+ is reduced to Pd0 with the increasement of the carbon chain lengths between sulfur bonds, which is the cause of deactivation. The mechanism is that a base abstracts a proton from the coordinated alcohol to form a Pd alcoholate species that subsequently undergo b-hydride elimination to give benzyl aldehyde, which is confirmed by the catalytic and characteristic results. Springer Science+Business Media New York 2014.
Process for the preparation of organosilicon compounds
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Page/Page column 4, (2008/06/13)
A process for the preparation of an organosilicon compound of the formula (I) [in-line-formulae](R1R2R3SiR4)2Sx??(I) [/in-line-formulae]by reacting haloalkoxysilanes of the general formula (II) [in-line-formulae]R1R2R3SiR4X??(II) [/in-line-formulae]with a dry polysulphide of the general formula (III) [in-line-formulae]M2Sz??(III) [/in-line-formulae]and/or dry sulphide of the general formula IV [in-line-formulae]M2S??(IV) [/in-line-formulae]and optionally sulphur in an organic solvent, the organic solvent being removed from the resulting suspension, the mixture containing the organosilicon compound of the general formula (I) and the solid MX being mixed with water containing at least one buffer, and the resulting phases being separated.
