Reactions of aniline - electrophilic aromatic substitution, Friedel-Crafts, Nitration, oxidation, the basicity of aniline and more,. Aniline . C6H5NH2. Synonyms: Aniline . CAS 62-53-3. Molecular Weight 93.13. Browse Aniline and related products at Merck. Anilines are aromatic amines with the formula C6H5NH2 or C6H7N. They are used in dyes, drugs, plastics and rubber, but they are also toxic and irritating. Learn more about their structure, properties, reactions and uses with examples and FAQs. Signs and Symptoms of Acute Aniline Exposure: Signs and symptoms of acute exposure to aniline may be severe and include dyspnea (shortness of breath), respiratory paralysis, cardiac arrhythmias, and cardiovascular collapse.