Benzenesulfonyl isocyanates, isothiocyanates, chlorides, and sulfonamides having a fluorinated substituent
申请人:E.I. DU PONT DE NEMOURS AND COMPANY
公开号:EP0064322A2
公开(公告)日:1982-11-10
Chemical intermediates useful in the production of herbicidal sulfonylureas have the general formula
wherein R is CF3, CHF2, CH2CF3 or CF2CHFG, where G is F, Cl, Br or CF3;
A is O or S(O)n, where n is 0, 1 or 2;
R1 is H, F, Cl, Br or CH3; and
L is Cl, NH2, NCO or NCS.
The novel compounds can be made by conventional processes, e.g. chlorosulfonation of the appropriately substituted starting material followed by reaction with ammonia to form the sulfonamide and conversion to the isocyanate with phosgene.
用于生产除草磺酰脲类的化学中间体通式如下
其中 R 是 CF3、CHF2、CH2CF3 或 CF2CHFG,G 是 F、Cl、Br 或 CF3;
A 是 O 或 S(O)n,其中 n 是 0、1 或 2;
R1 是 H、F、Cl、Br 或 CH3;以及
L 是 Cl、NH2、NCO 或 NCS。
新型化合物可通过传统工艺制得,例如对适当取代的起始材料进行氯磺化,然后与氨反应生成磺酰胺,再用光气转化为异氰酸酯。