| abstract |
lsocyanates and isothiocyanates of the general formulan whereinn A is substituted amino, haloalkoxy or optionally substituted phenoxy; R, is H, halogen, optionally substituted alkyl, N0 2 , OCH 3 , alkylcarbonyl, NCO, N(CH 3 ) 2 , CN, SCH 3 or SO 2 CH 3 ; R' 1 is H, halogen, CH 3 or OCH 3 ; W is 0 or S; are valuable intermediates for the preparation of herbicidal sulfonylureas. The novel compounds may be made e.g. by reacting the corresponding sulfonamide with phosgene to obtain the isocyanate, or with carbon disulfide and then with phosgene to obtain the isothiocyanate. |