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公开(公告)号:US5728881A
公开(公告)日:1998-03-17
申请号:US810883
申请日:1997-03-05
申请人: Stefan Kwiatkowski , Krzysztof Pupek , Miroslaw J. Golinski , Paul D. Smith , Lowell J. Lawrence
发明人: Stefan Kwiatkowski , Krzysztof Pupek , Miroslaw J. Golinski , Paul D. Smith , Lowell J. Lawrence
IPC分类号: C07C205/12 , C07C209/10 , C07C211/48 , C02C209/10
CPC分类号: C07C209/10 , C07C201/12 , Y02P20/582
摘要: A process is provided for preparing 2,6-dinitro-N,N-dipropyl-4-(trifluoromethyl)benzenamine from 4-chlorotrifluoromethylbenzene. The process includes a two stage nitration and an amination step. Ethylene dichloride is utilized as a diluent and solvent in the nitration steps. Spent acid from the first nitration is reconstituted with sulfur trioxide for use in the second nitration. Spent acid from the second nitration is used directly in the first nitration and evaporation is used to remove nitrosoamines from the final trifluralin product.
摘要翻译: 提供了从4-氯三氟甲基苯制备2,6-二硝基-N,N-二丙基-4-(三氟甲基)苯胺的方法。 该方法包括两步硝化和胺化步骤。 二氯化乙烯在硝化步骤中用作稀释剂和溶剂。 来自第一次硝化的废酸用三氧化硫重新配制用于第二次硝化。 来自第二硝化的废酸直接用于第一硝化,蒸发用于从最终的氟乐灵产物中除去亚硝基胺。
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2.
公开(公告)号:US5705698A
公开(公告)日:1998-01-06
申请号:US621403
申请日:1996-03-25
IPC分类号: C07C209/22
CPC分类号: C07C209/22
摘要: A process is provided for the preparation of isometrically pure pendimethalin and iso-pendimethalin as well as mixtures thereof.
摘要翻译: 提供了用于制备等度纯的二甲戊乐灵和异二甲戊乐灵以及它们的混合物的方法。
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公开(公告)号:US5688971A
公开(公告)日:1997-11-18
申请号:US689545
申请日:1996-08-09
IPC分类号: C07H9/04 , C07D493/00
CPC分类号: C07H9/04
摘要: A process is provided for producing dikegulac and its salts and derivatives from 2-keto-L-gulonic acid starting material.
摘要翻译: 提供了从2-酮-L-古洛糖酸起始原料制备二酮及其盐和衍生物的方法。
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