abstract |
Compounds of the formula:n wherein Y is OR¹, fluoro, chloro, methyl,n R¹, and R³ are independently selected from hydrogen and C₁-C₄ alkyl, R² is C₁-C₄ alkyl and X is fluoro, chloro or bromo, with the proviso that when Y is OH, X cannot be bromo and with the proviso that X can be fluoro only if R² is methyl. |