| 摘要 |
PURPOSE: Provided are a process for nitration and, in particular, a process for the nitration of aromatic and heteroaromatic compounds. The process is of particular use for nitrating diphenyl ethers to give compounds which are useful as herbicides or as intermediates in the synthesis of herbicides. CONSTITUTION: A compound has formula I: wherein R1 is hydrogen or C1 -C6 alkyl, C2 -C6 alkenyl or C2 -C6 alkynyl (any of which may optionally be substituted with one or more substituents selected from halogen and hydroxy) or COOR4, COR6, CONR4 R5 or CONHSO2 R4 ; R2 is hydrogen or halo; R3 is C1 -C4 alkyl or C2 -C4 alkenyl or C2 -C4 alkynyl (any of which may optionally be substituted with one or more halogen atoms) or halo; R4 and R5 independently represent hydrogen or C1 -C4 alkyl optionally substituted with one or more halogen atoms; and R6 is a halogen atom or a group R4.
|
