10366-05-9Relevant articles and documents
Preparation method of parylene
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Paragraph 0053-0055; 0058-0059, (2021/04/03)
The invention discloses a preparation method of parylene. The method comprises the steps: carrying out a reaction on a compound 1A to obtain a compound 2A; and reacting the compound 2A with a compound2B to obtain a parylene crude product, and purifying the parylene crude product to obtain a parylene fine product. According to the method, the reagent with lower price is used as a starting raw material, the final product is obtained through two-step reaction, the reaction condition of each step is mild, the yield of the obtained parylene is high, and the cost can be greatly reduced.
Method for synthesizing tetrachloro-paracyclophane
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Paragraph 0012; 0013; 0014, (2017/08/31)
The invention discloses a method for synthesizing tetrachloro-paracyclophane, and relates to the technical field of chemical synthesis. The method comprises the following steps: taking 3-chloromethyl benzyl chloride as a raw material to obtain dichloro-paracyclophane as a intermediate by using a Hofmann elimination method; carrying out chlorination on the intermediate by using chlorine to obtain a coarse product; and decolorizing, concentrating and drying the coarse product to obtain a finished product. The preparation method of the tetrachloro-paracyclophane is simple in process, reaction conditions are easy to control, the purity of the product is high, triethylamine and a solvent can be recycled in a reaction process, and the method is safe and environmentally friendly, and is low in production cost and easy to popularize.
A new protocol for the synthesis of 4,7,12,15-tetrachloro[2.2]paracyclophane
Pan, Donghui,Wang, Yanbin,Xiao, Guomin
, p. 2443 - 2449 (2016/12/07)
We report a green and convenient protocol to prepare 4,7,12,15-tetrachloro[2.2]paracyclophane, the precursor of parylene D, from 2,5-dichloro-p-xylene. In the first bromination step, with H2O2-HBr as a bromide source, this procedure becomes organic-waste-free and organic-solvent-free and can appropriately replace the existing bromination methods. The Winberg elimination-dimerization step, using aqueous sodium hydroxide solution instead of silver oxide for anion exchange, results in a significant improvement in product yield. Furthermore, four substituted [2.2]paracyclophanes were also prepared in this convenient way.
An improved method for the regiospecific synthesis of polysubstituted [2.2]paracyclophanes
Chow, Hak-Fun,Low, Kam-Hung,Wong, King Y.
, p. 2130 - 2134 (2007/10/03)
4,16-Disubstituted, 4,7,12,15-tetrasubstituted, 4,8,12,16-tetrasubstituted and 4,5,7,8,12,13,15,16-octasubstituted [2.2]paracyclophanes can be prepared in significantly improved yields and excellent regiospecificities via the Winberg 1,6-elimination-dimerization reaction from substituted (4-methylbenzyl) trimethylammonium hydroxides. Using 2-chloro-phenothiazine instead of phenothiazine as a polymerization inhibitor results in a doubling of product yields. Georg Thieme Verlag Stuttgart.