| 摘要 |
PCT No. PCT/EP97/03170 Sec. 371 Date Dec. 23, 1998 Sec. 102(e) Date Dec. 23, 1998 PCT Filed Jun. 18, 1997 PCT Pub. No. WO98/00396 PCT Pub. Date Jan. 8, 1998The invention relates to compounds of the formula (I) in which R=(subst.) alkyl or (subst.) cycloalkyl, which are suitable as intermediates for preparing herbicidal sulfonylureas. According to the invention, the compounds (I) are prepared by (a) diazotizing a compound of the formula (II) in the presence of an acid H+X-, where X- is an equivalent of an anion, to give the novel compounds (diazonium salts) of the formula (III) (b) reacting the compound of the formula (III) in the presence of iodide ions to give the compound (IV) and (c) reacting the compound of the formula (IV) with an isocyanate of the formula (V)R-N=C=O(V)in which R is as defined in formula (I), to give the compound of the formula (I). |
