##STR1## wherein R1 is a hydrogen atom, a C1 -C3 alkyl group, a C1 -C3 alkylthio group or a C2 -C3 alkoxyalkyl group; R2 is a halogen... 42 5179210 Preparation of N-substituted imidazoles A process for preparing N-substituted imidazoles of the formula I ##STR1## where R1 is C1 -C20 -alkyl, C2 -C20 -alkenyl, C2 -C20 -alkynyl, C2 -C20 -alkoxyalkyl, C3 -C20 -alkenyloxyalkyl, C3 -C12... 43 5179117 An