| 摘要 |
The invention relates to a process for preparing 2,3,5,6-tetrahaloxylylidene compounds of formula (I)where each Hal is independently fluorine or chlorine, and X is fluorine, chlorine, bromine, -O-R, or -O-C(=O)R, where R is hydrogen, a straight-chain or branched C1-C12-alkyl- or a C6-C14-aryl radical, by reacting 2,3,5,6-tetrahaloxylylidenediamines of formula (II)with an alkyl nitrite and/or nitrous acid in HX as a solvent.
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