- A new route to 2,3,5,6-tetrafluoroterephthal aldehyde and its chemical transformation
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The title compound was prepared from commercial available and cheaper starting material terephthalolyl chloride by six-step reaction sequence in total 40% yield. Its chemical transformations were also studied.
- Zhu, Shizheng,Zhao, Jingwei,Cai, Xian
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p. 451 - 454
(2007/10/03)
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- Process for the preparation of cyanotetrachlorobenzenes
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Cyanotetrachlorobenzenes, especially ortho- and para- dicyanotetrachlorobenzenes, are prepared by reacting in a liquid medium at 20°-100° C. a corresponding nitrotetrachlorobenzene with, in solution, an inorganic cyanide. Preferably the liquid medium is a two-phase water/water-immiscible organic solvent system, e.g. water/chloroform, a phase transfer catalyst is present and the inorganic cyanide is an alkali metal or alkaline earth metal cyanide.The compounds are useful chemical intermediates in the synthesis of, for instance, pesticidal compounds.
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- FORMATION OF AROMATIC NITRILES BY DIRECT REPLACEMENT OF THE NITRO GROUPS OF DINITROTETRACHLOROBENZENES
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Direct replacement of nitro by cyano groups has been effected by treatment of the dinitrotetrachlorobenzenes in refluxing chloroform with aqueous cyanide ion in the presence of a phase transfer catalyst.
- Milner, David J.
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p. 479 - 484
(2007/10/02)
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