The invention provides compounds of the general formula
 in which
R1 represents a hydrogen or halogen atom or an alkyl or haloalkyl group;
the or each group X independently represents a halogen atom or an optionally substituted alkyl or alkoxy group or an alkenyloxy, alkynyloxy, cyano, carboxy, alkoxycarbonyl, (alkylthio)carbonyl, alkylcarbonyl, amido, alkylamido, nitro, alkylthio, haloalkylthio, alkenylthio, alkynylthio, alkylsulphinyl, alkylsulphonyl, alkyloximinoalkyl or alkenyloximinoalkyl group;
n is 0 or an integer from 1 to 5; and
L is an alkoxy group.
                            该发明提供了一般公式中的化合物,其中R1代表氢原子或卤素原子或烷基或卤代烷基基团;每个X独立地代表卤素原子或可选择地取代的烷基或烷氧基团或烯氧基、炔氧基、
氰基、羧基、烷氧羰基、(烷基
硫)羰基、烷基羰基、酰胺基、烷基酰胺基、硝基、烷基
硫基、卤代烷基
硫基、烯基
硫基、炔基
硫基、烷基亚砜基、烷基砜基、烷氧基
亚胺基或烯基
亚胺基基团;n为0或1至5之间的整数;L为烷氧基。