Try a strongly acidic, reactive diazotizing agent in your R& D work. HO-S-0-N = 0 Try Du Pont nitrosylsulfuric acid. Whether you're developing or improving products, Du Pont nitrosylsulfuric acid (NSA) is a useful reagent for diazotizing amines without evolving nitrous acid fumes. NSA is a convenient, storage-stable, ready-to-use source of nitrosonium ion (NO+). Consider it in your R&D work.
Use your imagination. You can use NSA stoichiometrically to reduce pollution problems that result from nitrous acid fumes. You can have greater selection of concentration because there is no sodium nitrite salt build-up problem. You can add it directly to diazotization batches and interrupt the reaction without losing the batch. In fact, its the preferred diazotizing agent for weakly basic amines like negatively substituted anilines and aminoanthraquinones. You can evaluate it as a nitrosating agent in select reactions.
Apply for a sample. Currently used in making dyes, drugs and chemical intermediates, Du Pont NSA is supplied as a 40 percent solution in 87 percent sulfuric acid (on an NSA-free basis), ready to use and stable at room temperature. To get safety and handling information and apply for a sample of DuPont NSA, write on your company letterhead to Dr. B. C. Lawes, DuPont Company, Room X80010, Wilmington, DE 19898.
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