The present invention relates to novel benzimidazole derivatives, their preparation, their use as pharmaceuticals and pharmaceutical compositions containing them, wherein the compounds have the formula (I):
in which the substitutents are as defined in claim
1
and salts, solvates, hydrates and N-oxides thereof.
In the presence of ozone, nitrogen dioxide rapidly reacts with acetanilides ortho-selectively at low temperatures, giving a high proportion of ortho-nitro derivatives in good yields.
Process for the preparation of p-nitroaniline compounds by the alkaline
申请人:Eastman Kodak Company
公开号:US04151203A1
公开(公告)日:1979-04-24
Process for the preparation of certain substituted p-nitroaniline compounds essentially free of the corresponding o-nitroaniline compounds. The process comprises subjecting an alkanol solution of the anilides of such compounds to alkaline hydrolysis conditions, thereby effecting hydrolysis and precipitation of the p-nitroaniline compound essentially free of the undesired o-isomer. The compounds are intermediates useful in the preparation of azo pigments.