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::: 技術移轉

專利名稱 Method for the preparation of alpha,alpha,alpha',alpha'-tetrachloro-p-xylene with high purity | Method for the preparation of α,α,α',α'-tetrachloro-p-xylene with high purity
專利證號 US7060862B2
國別 美國
獲證日期 2006-06-13
專利摘要 A method of synthesizing a high purity product of α, α,α',α'-tetrachloro-p-xylene is disclosed. The method includes carrying out a first stage reaction of terephthaldicarboxaldehyde with a mixture of SOCl 2 and dimethylformamide (DMF) to obtain a product mixture containing α, α,α',α'-tetrachloro-p-xylene as a major product and 4-dichloromethyl benzaldehyde as a side product; adding SOCl2 and DMF to the product mixture of the first stage reaction to undergo a second stage reaction; and to a cool water adding the resulting product mixture from the second stage reaction to obtain a solid product of α,α,α',α'-tetrachloro-p-xylene with a purity of 90-99 mol %. A method of synthesizing a high purity product of alpha,alpha,alpha',alpha'-tetrachloro-p-xylene is disclosed. The method includes carrying out a first stage reaction of terephthaldicarboxaldehyde with a mixture of SOCl2 and dimethylformamide (DMF) to obtain a product mixture containing alpha,alpha,alpha',alpha'-tetrachloro-p-xylene as a major product and 4-dichloromethyl benzaldehyde as a side product; adding SOCl2 and DMF to the product mixture of the first stage reaction to undergo a second stage reaction; and to a cool water adding the resulting product mixture from the second stage reaction to obtain a solid product of alpha,alpha,alpha',alpha'-tetrachloro-p-xylene with a purity of 90-99 mol %.

IPC國際分類號

C07C001702 | C07C001700 | C07C001704 | C07C001706 | C07C001718 | C07C002204